(PHP 5 >= 5.3.0, PHP 7) Alias of

(PHP 4, PHP 5, PHP 7) Returns the day of the week

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Return the number of days in a month for a given year and calendar

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

(PECL hrtime >= 0.4.3) Get elapsed time for all intervals.

(PHP 5 >= 5.5.0, PHP 7) Returns new DateTimeImmutable object formatted according to the specified format

(PHP 5 >= 5.3.0, PHP 7) Creates a new DatePeriod object

(PHP 4, PHP 5, PHP 7) Get Unix timestamp for a GMT date

(PHP 5 >= 5.2.0, PHP 7) Alias of

(PHP 5 >= 5.3.0, PHP 7) Sets the date and time based on an Unix timestamp