diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5fbe2a..a76749f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.4.1-alpha
+
+- Changed all Carbon date endpoints to receive a string rather than a Carbon instance.
+
 ## v0.4.0-alpha
 
 - Completed remaining endpoints: 
diff --git a/README.md b/README.md
index eeb5999..49c7253 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,8 @@ $client = new MarketDataApp\Client('your_api_token');
 $quote = $client->indices->quote('DJI');
 $candles = $client->indices->candles(
     symbol: "DJI",
-    from: Carbon::parse('2022-09-01'),
-    to: Carbon::parse('2022-09-05'),
+    from: '2022-09-01',
+    to: '2022-09-05',
     resolution: 'D'
 );
 
@@ -37,17 +37,17 @@ $bulk_candles = $client->stocks->bulkCandles(['AAPL, MSFT']);
 $quote = $client->stocks->quote('AAPL');
 $quotes = $client->stocks->quotes(['AAPL', 'NFLX']);
 $bulk_quotes = $client->stocks->bulk_quotes(['AAPL', 'NFLX']);
-$earnings = $client->stocks->earnings(symbol: 'AAPL', from: Carbon::parse('2023-01-01'));
-$news = $client->stocks->news(symbol: 'AAPL', from: Carbon::parse('2023-01-01'));
+$earnings = $client->stocks->earnings(symbol: 'AAPL', from: '2023-01-01');
+$news = $client->stocks->news(symbol: 'AAPL', from: '2023-01-01');
 
 // Markets
-$status = $client->markets->status(date: Carbon::parse('2023-01-01'));
+$status = $client->markets->status(date: '2023-01-01');
 
 // Mutual Funds
 $candles = $client->mutual_funds->candles(
     symbol: 'VFINX',
-    from: Carbon::parse('2022-09-01'),
-    to: Carbon::parse('2022-09-05'),
+    from: '2022-09-01',
+    to: '2022-09-05',
     resolution: 'D'
 );
 
@@ -56,12 +56,12 @@ $expirations = $client->options->expirations('AAPL');
 $lookup = $client->options->lookup('AAPL 7/28/23 $200 Call');
 $strikes = $client->options->strikes(
     symbol: 'AAPL',
-    expiration: Carbon::parse('2023-01-20'),
-    date: Carbon::parse('2023-01-03'),
+    expiration: '2023-01-20',
+    date: '2023-01-03',
 );
 $option_chain = $client->options->option_chain(
     symbol: 'AAPL',
-    expiration: Carbon::parse('2025-01-17'),
+    expiration: '2025-01-17',
     side: Side::CALL,
 );
 $quotes = $client->options->quotes('AAPL250117C00150000');
diff --git a/src/Endpoints/Indices.php b/src/Endpoints/Indices.php
index 7ba0141..0ff4aea 100644
--- a/src/Endpoints/Indices.php
+++ b/src/Endpoints/Indices.php
@@ -2,7 +2,6 @@
 
 namespace MarketDataApp\Endpoints;
 
-use Carbon\Carbon;
 use GuzzleHttp\Exception\GuzzleException;
 use MarketDataApp\Client;
 use MarketDataApp\Endpoints\Responses\Indices\Candles;
@@ -38,8 +37,12 @@ public function quote(string $symbol, bool $fifty_two_week = false): Quote
      * @param string $symbol The index symbol, without any leading or trailing index identifiers. For example, use DJI
      * do not use $DJI, ^DJI, .DJI, DJI.X, etc.
      *
-     * @param Carbon $from The leftmost candle on a chart (inclusive). If you use countback, to is not required.
-     * @param Carbon|null $to The rightmost candle on a chart (inclusive).
+     * @param string $from The leftmost candle on a chart (inclusive). If you use countback, to is not required.
+     * Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
+     *
+     * @param string|null $to The rightmost candle on a chart (inclusive). Accepted timestamp inputs: ISO 8601, unix,
+     * spreadsheet.
+     *
      * @param string $resolution The duration of each candle.
      * Minutely Resolutions: (minutely, 1, 3, 5, 15, 30, 45, ...) Hourly Resolutions: (hourly, H, 1H, 2H, ...)
      * Daily Resolutions: (daily, D, 1D, 2D, ...)
@@ -51,12 +54,13 @@ public function quote(string $symbol, bool $fifty_two_week = false): Quote
      * is not required.
      *
      * @return Candles
-     * @throws GuzzleException|ApiException
+     * @throws ApiException
+     * @throws GuzzleException
      */
     public function candles(
         string $symbol,
-        Carbon $from,
-        Carbon $to = null,
+        string $from,
+        string $to = null,
         string $resolution = 'D',
         int $countback = null
     ): Candles {
diff --git a/src/Endpoints/Markets.php b/src/Endpoints/Markets.php
index dc4dff4..9c9c8af 100644
--- a/src/Endpoints/Markets.php
+++ b/src/Endpoints/Markets.php
@@ -2,7 +2,6 @@
 
 namespace MarketDataApp\Endpoints;
 
-use Carbon\Carbon;
 use GuzzleHttp\Exception\GuzzleException;
 use MarketDataApp\Client;
 use MarketDataApp\Endpoints\Responses\Markets\Statuses;
@@ -23,23 +22,28 @@ public function __construct($client)
      * Get the past, present, or future status for a stock market. The endpoint will respond with "open" for trading
      * days or "closed" for weekends or market holidays.
      *
-     * @param string $country The country. Use the two digit ISO 3166 country code. If no country is specified, US will
+     * @param string $country The country. Use the two-digit ISO 3166 country code. If no country is specified, US will
      * be assumed. Only countries that Market Data supports for stock price data are available (currently only the
      * United States).
      *
-     * @param Carbon|null $date Consult whether the market was open or closed on the specified date.
-     * @param Carbon|null $from The earliest date (inclusive). If you use countback, from is not required.
-     * @param Carbon|null $to The last date (inclusive).
+     * @param string|null $date Consult whether the market was open or closed on the specified date. Accepted timestamp
+     * inputs: ISO 8601, unix, spreadsheet.
+     *
+     * @param string|null $from The earliest date (inclusive). If you use countback, from is not required. Accepted
+     * timestamp inputs: ISO 8601, unix, spreadsheet.
+     *
+     * @param string|null $to The last date (inclusive). Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
+     *
      * @param int|null $countback Countback will fetch a number of dates before to If you use from, countback is not
      * required.
-     * @return Statuses
+     *
      * @throws GuzzleException|ApiException
      */
     public function status(
         string $country = "US",
-        Carbon $date = null,
-        Carbon $from = null,
-        Carbon $to = null,
+        string $date = null,
+        string $from = null,
+        string $to = null,
         int $countback = null
     ): Statuses {
         // Stub
diff --git a/src/Endpoints/MutualFunds.php b/src/Endpoints/MutualFunds.php
index 846f3a5..567681a 100644
--- a/src/Endpoints/MutualFunds.php
+++ b/src/Endpoints/MutualFunds.php
@@ -2,7 +2,6 @@
 
 namespace MarketDataApp\Endpoints;
 
-use Carbon\Carbon;
 use GuzzleHttp\Exception\GuzzleException;
 use MarketDataApp\Client;
 use MarketDataApp\Endpoints\Responses\MutualFunds\Candles;
@@ -23,14 +22,20 @@ public function __construct($client)
      * Get historical price candles for a mutual fund.
      *
      * @param string $symbol The mutual fund's ticker symbol.
-     * @param Carbon $from The leftmost candle on a chart (inclusive). If you use countback, to is not required.
-     * @param Carbon|null $to The rightmost candle on a chart (inclusive).
+     *
+     * @param string $from The leftmost candle on a chart (inclusive). If you use countback, to is not required.
+     * Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
+     *
+     * @param string|null $to The rightmost candle on a chart (inclusive). Accepted timestamp inputs: ISO 8601, unix,
+     * spreadsheet.
+     *
      * @param string $resolution The duration of each candle.
-     * Minutely Resolutions: (minutely, 1, 3, 5, 15, 30, 45, ...) Hourly Resolutions: (hourly, H, 1H, 2H, ...)
-     * Daily Resolutions: (daily, D, 1D, 2D, ...)
-     * Weekly Resolutions: (weekly, W, 1W, 2W, ...)
-     * Monthly Resolutions: (monthly, M, 1M, 2M, ...)
-     * Yearly Resolutions:(yearly, Y, 1Y, 2Y, ...)
+     *   - Minutely Resolutions: (minutely, 1, 3, 5, 15, 30, 45, ...)
+     *   - Hourly Resolutions: (hourly, H, 1H, 2H, ...)
+     *   - Daily Resolutions: (daily, D, 1D, 2D, ...)
+     *   - Weekly Resolutions: (weekly, W, 1W, 2W, ...)
+     *   - Monthly Resolutions: (monthly, M, 1M, 2M, ...)
+     *   - Yearly Resolutions:(yearly, Y, 1Y, 2Y, ...)
      *
      * @param int|null $countback Will fetch a number of candles before (to the left of) to. If you use from, countback
      * is not required.
@@ -40,8 +45,8 @@ public function __construct($client)
      */
     public function candles(
         string $symbol,
-        Carbon $from,
-        Carbon $to = null,
+        string $from,
+        string $to = null,
         string $resolution = 'D',
         int $countback = null,
     ): Candles {
diff --git a/src/Endpoints/Options.php b/src/Endpoints/Options.php
index 1fd9bb4..ad34446 100644
--- a/src/Endpoints/Options.php
+++ b/src/Endpoints/Options.php
@@ -2,7 +2,6 @@
 
 namespace MarketDataApp\Endpoints;
 
-use Carbon\Carbon;
 use GuzzleHttp\Exception\GuzzleException;
 use MarketDataApp\Client;
 use MarketDataApp\Endpoints\Responses\Options\Expirations;
@@ -35,13 +34,13 @@ public function __construct($client)
      * @param int|null $strike Limit the lookup of expiration dates to the strike provided. This will cause the endpoint to
      * only return expiration dates that include this strike.
      *
-     * @param Carbon|null $date Use to lookup a historical list of expiration dates from a specific previous trading
+     * @param string|null $date Use to lookup a historical list of expiration dates from a specific previous trading
      * day. If date is omitted the expiration dates will be from the current trading day during market hours or from the
-     * last trading day when the market is closed.
+     * last trading day when the market is closed. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
      * @throws ApiException|GuzzleException
      */
-    public function expirations(string $symbol, int $strike = null, Carbon $date = null): Expirations
+    public function expirations(string $symbol, int $strike = null, string $date = null): Expirations
     {
         // Stub
         return new Expirations($this->client->execute(self::BASE_URL . "options/expirations/$symbol",
@@ -72,15 +71,15 @@ public function lookup(string $input): Lookup
      *
      * @param string $symbol The underlying ticker symbol for the options chain you wish to lookup.
      *
-     * @param Carbon|null $expiration Limit the lookup of strikes to options that expire on a specific expiration date.
+     * @param string|null $expiration Limit the lookup of strikes to options that expire on a specific expiration date.
      *
-     * @param Carbon|null $date Use to lookup a historical list of strikes from a specific previous trading day. If date
+     * @param string|null $date Use to lookup a historical list of strikes from a specific previous trading day. If date
      * is omitted the expiration dates will be from the current trading day during market hours or from the last trading
-     * day when the market is closed.
+     * day when the market is closed. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
      * @throws ApiException|GuzzleException
      */
-    public function strikes(string $symbol, Carbon $expiration = null, Carbon $date = null): Strikes
+    public function strikes(string $symbol, string $expiration = null, string $date = null): Strikes
     {
         // Stub
         return new Strikes($this->client->execute(self::BASE_URL . "options/strikes/$symbol",
@@ -97,13 +96,15 @@ public function strikes(string $symbol, Carbon $expiration = null, Carbon $date
      * all expirations.
      *
      * @param string $symbol The ticker symbol of the underlying asset.
-     * @param Carbon|null $date Use to lookup a historical end of day options chain from a specific trading day. If no
+     *
+     * @param string|null $date Use to lookup a historical end of day options chain from a specific trading day. If no
      * date is specified the chain will be the most current chain available during market hours. When the market is
-     * closed the chain will be from the last trading day.
+     * closed the chain will be from the last trading day. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
-     * @param Carbon|Expiration $expiration
+     * @param string|Expiration $expiration
      * - Limits the option chain to a specific expiration date. Accepted date inputs: ISO 8601, unix, spreadsheet. This
-     * parameter is only required if requesting a quote along with the chain.
+     * parameter is only required if requesting a quote along with the chain. Accepted timestamp inputs: ISO 8601, unix,
+     * spreadsheet.
      *
      * - If omitted the next monthly expiration for real-time quotes or the next monthly expiration relative to the date
      * parameter for historical quotes will be returned.
@@ -114,11 +115,11 @@ public function strikes(string $symbol, Carbon $expiration = null, Carbon $date
      * consume your requests very quickly. The full SPX option chain has more than 20,000 contracts. A request is
      * consumed for each contact you request with a price in the option chain.
      *
-     * @param Carbon|null $from Limit the option chain to expiration dates after from (inclusive). Should be combined
-     * with to create a range.
+     * @param string|null $from Limit the option chain to expiration dates after from (inclusive). Should be combined
+     * with to create a range. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
-     * @param Carbon|null $to Limit the option chain to expiration dates before to (not inclusive). Should be combined
-     * with from to create a range.
+     * @param string|null $to Limit the option chain to expiration dates before to (not inclusive). Should be combined
+     * with from to create a range. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
      * @param int|null $month Limit the option chain to options that expire in a specific month (1-12).
      *
@@ -202,10 +203,10 @@ public function strikes(string $symbol, Carbon $expiration = null, Carbon $date
      */
     public function option_chain(
         string $symbol,
-        Carbon $date = null,
-        Carbon|Expiration $expiration = Expiration::ALL,
-        Carbon $from = null,
-        Carbon $to = null,
+        string $date = null,
+        string|Expiration $expiration = Expiration::ALL,
+        string $from = null,
+        string $to = null,
         int $month = null,
         int $year = null,
         bool $weekly = true,
@@ -261,21 +262,23 @@ public function option_chain(
      * @param string $option_symbol The option symbol (as defined by the OCC) for the option you wish to lookup. Use the
      * current OCC option symbol format, even for historic options that quoted before the format change in 2010.
      *
-     * @param Carbon|null $date Use to lookup a historical end of day quote from a specific trading day. If no date is
+     * @param string|null $date Use to lookup a historical end of day quote from a specific trading day. If no date is
      * specified the quote will be the most current price available during market hours. When the market is closed the
-     * quote will be from the last trading day.
+     * quote will be from the last trading day. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
-     * @param Carbon|null $from Use to lookup a series of end of day quotes. From is the oldest (leftmost) date to
+     * @param string|null $from Use to lookup a series of end of day quotes. From is the oldest (leftmost) date to
      * return (inclusive). If from/to is not specified the quote will be the most current price available during market
-     * hours. When the market is closed the quote will be from the last trading day.
+     * hours. When the market is closed the quote will be from the last trading day. Accepted timestamp inputs: ISO
+     * 8601, unix, spreadsheet.
      *
-     * @param Carbon|null $to Use to lookup a series of end of day quotes. From is the newest (rightmost) date to return
+     * @param string|null $to Use to lookup a series of end of day quotes. From is the newest (rightmost) date to return
      * (exclusive). If from/to is not specified the quote will be the most current price available during market hours.
-     * When the market is closed the quote will be from the last trading day.
+     * When the market is closed the quote will be from the last trading day. Accepted timestamp inputs: ISO 8601, unix,
+     * spreadsheet.
      *
      * @throws ApiException|GuzzleException
      */
-    public function quotes(string $option_symbol, Carbon $date = null, Carbon $from = null, Carbon $to = null): Quotes
+    public function quotes(string $option_symbol, string $date = null, string $from = null, string $to = null): Quotes
     {
         // Stub
         return new Quotes($this->client->execute(self::BASE_URL . "options/quotes/$option_symbol/",
diff --git a/src/Endpoints/Stocks.php b/src/Endpoints/Stocks.php
index 78f8174..848bd79 100644
--- a/src/Endpoints/Stocks.php
+++ b/src/Endpoints/Stocks.php
@@ -2,7 +2,6 @@
 
 namespace MarketDataApp\Endpoints;
 
-use Carbon\Carbon;
 use GuzzleHttp\Exception\GuzzleException;
 use MarketDataApp\Client;
 use MarketDataApp\Endpoints\Responses\Stocks\BulkCandles;
@@ -40,11 +39,11 @@ public function __construct($client)
      * @param bool $snapshot Returns candles for all available symbols for the date indicated. The symbols parameter can
      * be omitted if snapshot is set to true.
      *
-     * @param Carbon|null $date The date of the candles to be returned. If no date is specified, during market hours the
+     * @param string|null $date The date of the candles to be returned. If no date is specified, during market hours the
      * candles returned will be from the current session. If the market is closed the candles will be from the most
-     * recent session.
+     * recent session. Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
      *
-     * @param bool $adjustsplits Adjust historical data for historical splits and reverse splits. Market Data uses
+     * @param bool $adjust_splits Adjust historical data for historical splits and reverse splits. Market Data uses
      * the CRSP methodology for adjustment. Daily candles default: true.
      *
      * @return BulkCandles
@@ -55,8 +54,8 @@ public function bulkCandles(
         array $symbols = [],
         string $resolution = 'D',
         bool $snapshot = false,
-        Carbon $date = null,
-        bool $adjustsplits = false,
+        string $date = null,
+        bool $adjust_splits = false,
     ): BulkCandles {
         if (empty($symbols) && !$snapshot) {
             throw new \InvalidArgumentException('Either symbols or snapshot must be set');
@@ -65,7 +64,12 @@ public function bulkCandles(
         $symbols = implode(',', array_map('trim', $symbols));
 
         return new BulkCandles($this->client->execute(self::BASE_URL . "bulkcandles/{$resolution}/",
-            compact('symbols', 'date', 'snapshot', 'adjustsplits')
+            [
+                'symbols'      => $symbols,
+                'snapshot'     => $snapshot,
+                'date'         => $date,
+                'adjustsplits' => $adjust_splits
+            ]
         ));
     }
 
@@ -73,14 +77,20 @@ public function bulkCandles(
      * Get historical price candles for an index.
      *
      * @param string $symbol The company's ticker symbol.
-     * @param Carbon $from The leftmost candle on a chart (inclusive). If you use countback, to is not required.
-     * @param Carbon|null $to The rightmost candle on a chart (inclusive).
+     *
+     * @param string $from The leftmost candle on a chart (inclusive). If you use countback, to is not required.
+     * Accepted timestamp inputs: ISO 8601, unix, spreadsheet.
+     *
+     * @param string|null $to The rightmost candle on a chart (inclusive). Accepted timestamp inputs: ISO 8601, unix,
+     * spreadsheet.
+     *
      * @param string $resolution The duration of each candle.
-     * Minutely Resolutions: (minutely, 1, 3, 5, 15, 30, 45, ...) Hourly Resolutions: (hourly, H, 1H, 2H, ...)
-     * Daily Resolutions: (daily, D, 1D, 2D, ...)
-     * Weekly Resolutions: (weekly, W, 1W, 2W, ...)
-     * Monthly Resolutions: (monthly, M, 1M, 2M, ...)
-     * Yearly Resolutions:(yearly, Y, 1Y, 2Y, ...)
+     *   - Minutely Resolutions: (minutely, 1, 3, 5, 15, 30, 45, ...)
+     *   - Hourly Resolutions: (hourly, H, 1H, 2H, ...)
+     *   - Daily Resolutions: (daily, D, 1D, 2D, ...)
+     *   - Weekly Resolutions: (weekly, W, 1W, 2W, ...)
+     *   - Monthly Resolutions: (monthly, M, 1M, 2M, ...)
+     *   - Yearly Resolutions:(yearly, Y, 1Y, 2Y, ...)
      *
      * @param int|null $countback Will fetch a number of candles before (to the left of) to. If you use from, countback
      * is not required.
@@ -98,10 +108,10 @@ public function bulkCandles(
      * the exchange, but not the exchange code. Use the two digit ISO 3166 country code. If no country is specified, US
      * exchanges will be assumed.
      *
-     * @param bool $adjustsplits Adjust historical data for for historical splits and reverse splits. Market Data uses
+     * @param bool $adjust_splits Adjust historical data for for historical splits and reverse splits. Market Data uses
      * the CRSP methodology for adjustment. Daily candles default: true. Intraday candles default: false.
      *
-     * @param bool $adjustdividends CAUTION: Adjusted dividend data is planned for the future, but not yet implemented.
+     * @param bool $adjust_dividends CAUTION: Adjusted dividend data is planned for the future, but not yet implemented.
      * All data is currently returned unadjusted for dividends. Market Data uses the CRSP methodology for adjustment.
      * Daily candles default: true. Intraday candles default: false.
      *
@@ -110,18 +120,26 @@ public function bulkCandles(
      */
     public function candles(
         string $symbol,
-        Carbon $from,
-        Carbon $to = null,
+        string $from,
+        string $to = null,
         string $resolution = 'D',
         int $countback = null,
         string $exchange = null,
         bool $extended = false,
         string $country = null,
-        bool $adjustsplits = false,
-        bool $adjustdividends = false,
+        bool $adjust_splits = false,
+        bool $adjust_dividends = false,
     ): Candles {
-        return new Candles($this->client->execute(self::BASE_URL . "candles/{$resolution}/{$symbol}/",
-            compact('from', 'to', 'countback', 'exchange', 'extended', 'country', 'adjustsplits', 'adjustdividends')
+        return new Candles($this->client->execute(self::BASE_URL . "candles/{$resolution}/{$symbol}/", [
+                'from'            => $from,
+                'to'              => $to,
+                'countback'       => $countback,
+                'exchange'        => $exchange,
+                'extended'        => $extended,
+                'country'         => $country,
+                'adjustsplits'    => $adjust_splits,
+                'adjustdividends' => $adjust_dividends
+            ]
         ));
     }
 
@@ -192,14 +210,14 @@ public function bulkQuotes(array $symbols = [], bool $snapshot = false): BulkQuo
      * Premium subscription required.
      *
      * @param string $symbol The company's ticker symbol.
-     * @param Carbon|null $from The earliest earnings report to include in the output. If you use countback, from is not
+     * @param string|null $from The earliest earnings report to include in the output. If you use countback, from is not
      * required.
      *
-     * @param Carbon|null $to The latest earnings report to include in the output.
+     * @param string|null $to The latest earnings report to include in the output.
      * @param int|null $countback Countback will fetch a specific number of earnings reports before to. If you use from,
      * countback is not required.
      *
-     * @param Carbon|null $date Retrieve a specific earnings report by date.
+     * @param string|null $date Retrieve a specific earnings report by date.
      * @param string|null $datekey Retrieve a specific earnings report by date and quarter. Example: 2023-Q4. This
      * allows you to retrieve a 4th quarter value without knowing the company's specific fiscal year.
      *
@@ -209,10 +227,10 @@ public function bulkQuotes(array $symbols = [], bool $snapshot = false): BulkQuo
      */
     public function earnings(
         string $symbol,
-        Carbon $from = null,
-        Carbon $to = null,
+        string $from = null,
+        string $to = null,
         int $countback = null,
-        Carbon $date = null,
+        string $date = null,
         string $datekey = null
     ): Earnings {
         if (is_null($from) && (is_null($countback) || is_null($to))) {
@@ -229,20 +247,20 @@ public function earnings(
      * CAUTION: This endpoint is in beta.
      *
      * @param string $symbol The ticker symbol of the stock.
-     * @param Carbon|null $from The earliest news to include in the output. If you use countback, from is not required.
-     * @param Carbon|null $to The latest news to include in the output.
+     * @param string|null $from The earliest news to include in the output. If you use countback, from is not required.
+     * @param string|null $to The latest news to include in the output.
      * @param int|null $countback Countback will fetch a specific number of news before to. If you use from, countback
      * is not required.
      *
-     * @param Carbon|null $date Retrieve news for a specific day.
+     * @param string|null $date Retrieve news for a specific day.
      * @throws \InvalidArgumentException
      */
     public function news(
         string $symbol,
-        Carbon $from = null,
-        Carbon $to = null,
+        string $from = null,
+        string $to = null,
         int $countback = null,
-        Carbon $date = null,
+        string $date = null,
     ): News {
         if (is_null($from) && (is_null($countback) || is_null($to))) {
             throw new \InvalidArgumentException('Either `from` or `countback` and `to` must be set');
diff --git a/tests/IndicesTest.php b/tests/IndicesTest.php
index 80e450b..8ade408 100644
--- a/tests/IndicesTest.php
+++ b/tests/IndicesTest.php
@@ -90,8 +90,8 @@ public function testCandles_fromTo_success()
 
         $response = $this->client->indices->candles(
             symbol: "DJI",
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -122,8 +122,8 @@ public function testCandles_noData_success()
 
         $response = $this->client->indices->candles(
             symbol: "DJI",
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -147,8 +147,8 @@ public function testCandles_noDataNextTime_success()
 
         $response = $this->client->indices->candles(
             symbol: "DJI",
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
diff --git a/tests/MarketsTest.php b/tests/MarketsTest.php
index 9a98b92..1621413 100644
--- a/tests/MarketsTest.php
+++ b/tests/MarketsTest.php
@@ -34,7 +34,7 @@ public function testStatus_success()
         $this->setMockResponses([new Response(200, [], json_encode($mocked_response))]);
 
         $response = $this->client->markets->status(
-            date: Carbon::createFromTimestamp(1680580800)
+            date: '1680580800'
         );
 
         // Verify that the response is an object of the correct type.
diff --git a/tests/MutualFundsTest.php b/tests/MutualFundsTest.php
index 93aca96..350e6fb 100644
--- a/tests/MutualFundsTest.php
+++ b/tests/MutualFundsTest.php
@@ -40,8 +40,8 @@ public function testCandles_fromTo_success()
 
         $response = $this->client->mutual_funds->candles(
             symbol: 'VFINX',
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -72,8 +72,8 @@ public function testCandles_noData_success()
 
         $response = $this->client->mutual_funds->candles(
             symbol: 'VFINX',
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -96,8 +96,8 @@ public function testCandles_noDataNextTime_success()
 
         $response = $this->client->mutual_funds->candles(
             symbol: 'VFINX',
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
diff --git a/tests/OptionsTest.php b/tests/OptionsTest.php
index 9c545c5..196eb41 100644
--- a/tests/OptionsTest.php
+++ b/tests/OptionsTest.php
@@ -101,8 +101,8 @@ public function testStrikes_success()
 
         $response = $this->client->options->strikes(
             symbol: 'AAPL',
-            expiration: Carbon::parse('2023-01-20'),
-            date: Carbon::parse('2023-01-03'),
+            expiration: '2023-01-20',
+            date: '2023-01-03',
         );
 
         // Verify that the response is an object of the correct type.
@@ -122,8 +122,8 @@ public function testStrikes_noData_success()
 
         $response = $this->client->options->strikes(
             symbol: 'AAPL',
-            expiration: Carbon::parse('2023-01-20'),
-            date: Carbon::parse('2023-01-03'),
+            expiration: '2023-01-20',
+            date: '2023-01-03',
         );
 
         // Verify that the response is an object of the correct type.
@@ -245,7 +245,7 @@ public function testOptionChain_success()
 
         $response = $this->client->options->option_chain(
             symbol: 'AAPL',
-            expiration: Carbon::parse('2025-01-17'),
+            expiration: '2025-01-17',
             side: Side::CALL,
         );
 
diff --git a/tests/StocksTest.php b/tests/StocksTest.php
index 1e40c0b..60145bf 100644
--- a/tests/StocksTest.php
+++ b/tests/StocksTest.php
@@ -83,8 +83,8 @@ public function testCandles_fromTo_success()
 
         $response = $this->client->stocks->candles(
             symbol: "AAPL",
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -116,8 +116,8 @@ public function testCandles_noData_success()
 
         $response = $this->client->stocks->candles(
             symbol: "AAPl",
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -140,8 +140,8 @@ public function testCandles_noDataNextTime_success()
 
         $response = $this->client->stocks->candles(
             symbol: "AAPL",
-            from: Carbon::parse('2022-09-01'),
-            to: Carbon::parse('2022-09-05'),
+            from: '2022-09-01',
+            to: '2022-09-05',
             resolution: 'D'
         );
 
@@ -399,7 +399,7 @@ public function testEarnings_success()
             'updated'        => 1701690000
         ];
         $this->setMockResponses([new Response(200, [], json_encode($mocked_response))]);
-        $earnings = $this->client->stocks->earnings(symbol: 'AAPL', from: Carbon::parse('2023-01-01'));
+        $earnings = $this->client->stocks->earnings(symbol: 'AAPL', from: '2023-01-01');
 
         $this->assertInstanceOf(Earnings::class, $earnings);
         $this->assertEquals($mocked_response['s'], $earnings->status);
@@ -438,7 +438,7 @@ public function testNews_success()
             'publicationDate' => 1703041200
         ];
         $this->setMockResponses([new Response(200, [], json_encode($mocked_response))]);
-        $news = $this->client->stocks->news(symbol: 'AAPL', from: Carbon::parse('2023-01-01'));
+        $news = $this->client->stocks->news(symbol: 'AAPL', from: '2023-01-01');
 
         $this->assertInstanceOf(News::class, $news);
         $this->assertEquals($mocked_response['s'], $news->status);