(PHP 5 >= 5.2.0, PHP 7) Alters the timestamp

(PHP 5 >= 5.5.0, PHP 7) Subtracts an amount of days, months, years, hours, minutes and seconds

(PHP 4, PHP 5, PHP 7) Return current Unix timestamp

(PHP 5 >= 5.3.0, PHP 7) Returns the difference between two DateTime objects

(PHP 4, PHP 5, PHP 7) Converts a date in the Jewish Calendar to Julian Day Count

(PHP 5 >= 5.5.0, PHP 7) Alias of

(PHP 5 >= 5.2.0, PHP 7) Returns the timezone offset from GMT

(PHP 5 >= 5.6.0, PHP 7) Returns new DateTimeImmutable object encapsulating the given DateTime object

(PHP 5 >= 5.1.0, PHP 7) Gets the default timezone used by all date/time functions in a script

(PHP 4, PHP 5, PHP 7) Converts a date from the French Republican Calendar to a Julian Day Count