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PHP Manual Date/Time Installing/Configuring Predefined Constants Examples DateTime DateTimeImmutable DateTimeInterface DateTimeZone DateInterval DatePeriod Date/Time Functions Date/Time Errors and Exceptions Supported Date and Time Formats List of Supported Timezones DateError DateObjectError DateRangeError DateException DateInvalidOperationException DateInvalidTimeZoneException DateMalformedIntervalStringException DateMalformedPeriodStringException DateMalformedStringException   Predefined Constants Date/Time Arithmetic Date/Time Last updated: Mon, 26 Oct 2026 Examples Table of Contents Date/Time Arithmetic Predefined Constants Date/Time Arithmetic Date/Time Last updated: Mon, 26 Oct 2026

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