diff --git a/PostHog/Utils/DateUtils.swift b/PostHog/Utils/DateUtils.swift
index 2f7f1ecd1..d16f6cc8d 100644
--- a/PostHog/Utils/DateUtils.swift
+++ b/PostHog/Utils/DateUtils.swift
@@ -12,11 +12,10 @@ private func newDateFormatter() -> DateFormatter {
     dateFormatter.locale = Locale(identifier: "en_US_POSIX")
     dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
 
-    dateFormatter.dateFormat = "yyyy-MM-dd'T'hh:mm:ss.SSS'Z'" // Use 'hh' for 12-hour clock
+    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
     return dateFormatter
 }
 
-// returns 2024-02-09T10:53:53.781Z
 public func toISO8601String(_ date: Date) -> String {
     let dateFormatter = newDateFormatter()
     return dateFormatter.string(from: date)