diff --git a/exposed-java-time/src/main/kotlin/org/jetbrains/exposed/sql/javatime/JavaDateFunctions.kt b/exposed-java-time/src/main/kotlin/org/jetbrains/exposed/sql/javatime/JavaDateFunctions.kt
index 50b56bc16a..408c2d8190 100644
--- a/exposed-java-time/src/main/kotlin/org/jetbrains/exposed/sql/javatime/JavaDateFunctions.kt
+++ b/exposed-java-time/src/main/kotlin/org/jetbrains/exposed/sql/javatime/JavaDateFunctions.kt
@@ -19,13 +19,16 @@ class Time<T : Temporal?>(val expr: Expression<T>) : Function<LocalTime>(JavaLoc
     override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder { append("Time(", expr, ")") }
 }
 
-class CurrentDateTime : Function<LocalDateTime>(JavaLocalDateTimeColumnType.INSTANCE) {
+object CurrentDateTime : Function<LocalDateTime>(JavaLocalDateTimeColumnType.INSTANCE) {
     override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder {
         +when {
             (currentDialect as? MysqlDialect)?.isFractionDateTimeSupported() == true -> "CURRENT_TIMESTAMP(6)"
             else -> "CURRENT_TIMESTAMP"
         }
     }
+
+    @Deprecated("This class is now a singleton, no need for its constructor call; this method is provided for backward-compatibility only, and will be removed in future releases")
+    operator fun invoke() = this
 }
 
 class CurrentTimestamp<T : Temporal> : Expression<T>() {
diff --git a/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/DefaultsTest.kt b/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/DefaultsTest.kt
index 984c02a5fe..226b47f69b 100644
--- a/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/DefaultsTest.kt
+++ b/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/DefaultsTest.kt
@@ -27,7 +27,7 @@ class DefaultsTest : DatabaseTestsBase() {
     object TableWithDBDefault : IntIdTable() {
         var cIndex = 0
         val field = varchar("field", 100)
-        val t1 = datetime("t1").defaultExpression(CurrentDateTime())
+        val t1 = datetime("t1").defaultExpression(CurrentDateTime)
         val clientDefault = integer("clientDefault").clientDefault { cIndex++ }
     }
 
@@ -144,7 +144,7 @@ class DefaultsTest : DatabaseTestsBase() {
 
     @Test
     fun testDefaults01() {
-        val currentDT = CurrentDateTime()
+        val currentDT = CurrentDateTime
         val nowExpression = object : Expression<LocalDateTime>() {
             override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder {
                 +when (val dialect = currentDialectTest) {
@@ -249,7 +249,7 @@ class DefaultsTest : DatabaseTestsBase() {
 
         val foo = object : IntIdTable("foo") {
             val name = text("name")
-            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime())
+            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime)
             val defaultInt = integer("defaultInteger").defaultExpression(abs(-100))
         }
 
diff --git a/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/JavaTimeTests.kt b/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/JavaTimeTests.kt
index 6631cf9ee8..d4bef97722 100644
--- a/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/JavaTimeTests.kt
+++ b/exposed-java-time/src/test/kotlin/org/jetbrains/exposed/JavaTimeTests.kt
@@ -45,7 +45,7 @@ open class JavaTimeBaseTest : DatabaseTestsBase() {
     @Test
     fun testSQLiteDateTimeFieldRegression() {
         val TestDate = object : IntIdTable("TestDate") {
-            val time = datetime("time").defaultExpression(CurrentDateTime())
+            val time = datetime("time").defaultExpression(CurrentDateTime)
         }
 
         withDb(TestDB.SQLITE) {
diff --git a/exposed-jodatime/src/main/kotlin/org/jetbrains/exposed/sql/jodatime/DateFunctions.kt b/exposed-jodatime/src/main/kotlin/org/jetbrains/exposed/sql/jodatime/DateFunctions.kt
index d5b3fdd949..eec695b607 100644
--- a/exposed-jodatime/src/main/kotlin/org/jetbrains/exposed/sql/jodatime/DateFunctions.kt
+++ b/exposed-jodatime/src/main/kotlin/org/jetbrains/exposed/sql/jodatime/DateFunctions.kt
@@ -10,13 +10,16 @@ class Date<T : DateTime?>(val expr: Expression<T>) : Function<DateTime>(DateColu
     override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder { append("DATE(", expr, ")") }
 }
 
-class CurrentDateTime : Function<DateTime>(DateColumnType(false)) {
+object CurrentDateTime : Function<DateTime>(DateColumnType(false)) {
     override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder {
         +when {
             (currentDialect as? MysqlDialect)?.isFractionDateTimeSupported() == true -> "CURRENT_TIMESTAMP(6)"
             else -> "CURRENT_TIMESTAMP"
         }
     }
+
+    @Deprecated("This class is now a singleton, no need for its constructor call; this method is provided for backward-compatibility only, and will be removed in future releases")
+    operator fun invoke() = this
 }
 
 class Year<T : DateTime?>(val expr: Expression<T>) : Function<Int>(IntegerColumnType()) {
diff --git a/exposed-jodatime/src/test/kotlin/org/jetbrains/exposed/JodaTimeDefaultsTest.kt b/exposed-jodatime/src/test/kotlin/org/jetbrains/exposed/JodaTimeDefaultsTest.kt
index 8f44cc5315..52126fd1a8 100644
--- a/exposed-jodatime/src/test/kotlin/org/jetbrains/exposed/JodaTimeDefaultsTest.kt
+++ b/exposed-jodatime/src/test/kotlin/org/jetbrains/exposed/JodaTimeDefaultsTest.kt
@@ -31,7 +31,7 @@ class JodaTimeDefaultsTest : JodaTimeBaseTest() {
     object TableWithDBDefault : IntIdTable() {
         var cIndex = 0
         val field = varchar("field", 100)
-        val t1 = datetime("t1").defaultExpression(CurrentDateTime())
+        val t1 = datetime("t1").defaultExpression(CurrentDateTime)
         val clientDefault = integer("clientDefault").clientDefault { cIndex++ }
     }
 
@@ -137,7 +137,7 @@ class JodaTimeDefaultsTest : JodaTimeBaseTest() {
 
     @Test
     fun testDefaults01() {
-        val currentDT = CurrentDateTime()
+        val currentDT = CurrentDateTime
         val nowExpression = object : Expression<DateTime>() {
             override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder {
                 +when (val dialect = currentDialect) {
@@ -218,7 +218,7 @@ class JodaTimeDefaultsTest : JodaTimeBaseTest() {
 
         val foo = object : IntIdTable("foo") {
             val name = text("name")
-            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime())
+            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime)
             val defaultInt = integer("defaultInteger").defaultExpression(abs(-100))
         }
 
@@ -237,7 +237,7 @@ class JodaTimeDefaultsTest : JodaTimeBaseTest() {
     fun testDefaultExpressions02() {
         val foo = object : IntIdTable("foo") {
             val name = text("name")
-            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime())
+            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime)
         }
 
         val nonDefaultDate = DateTime.parse("2000-01-01")
@@ -266,7 +266,7 @@ class JodaTimeDefaultsTest : JodaTimeBaseTest() {
     @Test
     fun defaultCurrentDateTimeTest() {
         val TestDate = object : IntIdTable("TestDate") {
-            val time = datetime("time").defaultExpression(CurrentDateTime())
+            val time = datetime("time").defaultExpression(CurrentDateTime)
         }
 
         withTables(TestDate) {
@@ -297,7 +297,7 @@ class JodaTimeDefaultsTest : JodaTimeBaseTest() {
     @Test
     fun testSQLiteDateTimeFieldRegression() {
         val TestDate = object : IntIdTable("TestDate") {
-            val time = datetime("time").defaultExpression(CurrentDateTime())
+            val time = datetime("time").defaultExpression(CurrentDateTime)
         }
 
         withDb(TestDB.SQLITE) {
diff --git a/exposed-kotlin-datetime/src/main/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinDateFunctions.kt b/exposed-kotlin-datetime/src/main/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinDateFunctions.kt
index ed7b7a08e4..da78768055 100644
--- a/exposed-kotlin-datetime/src/main/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinDateFunctions.kt
+++ b/exposed-kotlin-datetime/src/main/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinDateFunctions.kt
@@ -27,13 +27,16 @@ fun <T: Instant?> Date(expr: Expression<T>): Function<LocalDate> = DateInternal(
 //    override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder { append("Time(", expr, ")") }
 //}
 
-class CurrentDateTime : Function<LocalDateTime>(KotlinLocalDateTimeColumnType.INSTANCE) {
+object CurrentDateTime : Function<LocalDateTime>(KotlinLocalDateTimeColumnType.INSTANCE) {
     override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder {
         +when {
             (currentDialect as? MysqlDialect)?.isFractionDateTimeSupported() == true -> "CURRENT_TIMESTAMP(6)"
             else -> "CURRENT_TIMESTAMP"
         }
     }
+
+    @Deprecated("This class is now a singleton, no need for its constructor call; this method is provided for backward-compatibility only, and will be removed in future releases")
+    operator fun invoke() = this
 }
 
 class CurrentTimestamp<T> : Expression<T>() {
diff --git a/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/DefaultsTest.kt b/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/DefaultsTest.kt
index a55369eaaa..b78b21e9b3 100644
--- a/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/DefaultsTest.kt
+++ b/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/DefaultsTest.kt
@@ -37,7 +37,7 @@ class DefaultsTest : DatabaseTestsBase() {
     object TableWithDBDefault : IntIdTable() {
         var cIndex = 0
         val field = varchar("field", 100)
-        val t1 = datetime("t1").defaultExpression(CurrentDateTime())
+        val t1 = datetime("t1").defaultExpression(CurrentDateTime)
         val clientDefault = integer("clientDefault").clientDefault { cIndex++ }
     }
 
@@ -154,7 +154,7 @@ class DefaultsTest : DatabaseTestsBase() {
 
     @Test
     fun testDefaults01() {
-        val currentDT = CurrentDateTime()
+        val currentDT = CurrentDateTime
         val nowExpression = object : Expression<LocalDateTime>() {
             override fun toQueryBuilder(queryBuilder: QueryBuilder) = queryBuilder {
                 +when (val dialect = currentDialectTest) {
@@ -261,7 +261,7 @@ class DefaultsTest : DatabaseTestsBase() {
 
         val foo = object : IntIdTable("foo") {
             val name = text("name")
-            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime())
+            val defaultDateTime = datetime("defaultDateTime").defaultExpression(CurrentDateTime)
             val defaultInt = integer("defaultInteger").defaultExpression(abs(-100))
         }
 
diff --git a/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinTimeTests.kt b/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinTimeTests.kt
index 2fc43aab46..2efb51e88b 100644
--- a/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinTimeTests.kt
+++ b/exposed-kotlin-datetime/src/test/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinTimeTests.kt
@@ -46,7 +46,7 @@ open class KotlinTimeBaseTest : DatabaseTestsBase() {
     @Test
     fun testSQLiteDateTimeFieldRegression() {
         val TestDate = object : IntIdTable("TestDate") {
-            val time = datetime("time").defaultExpression(CurrentDateTime())
+            val time = datetime("time").defaultExpression(CurrentDateTime)
         }
 
         withDb(TestDB.SQLITE) {