Returns a string formatted according to the given format string using the given integer timestamp or the current time if no timestamp is given. In other words, timestamp is optional and defaults to the value of time.
Format accepted by DateTimeInterface::format.
The optional timestamp parameter is an int Unix timestamp that defaults to the current local time if timestamp is omitted or null. In other words, it defaults to the value of time.
Returns a formatted date string. If a non-numeric value is used for timestamp, false is returned and an E_WARNING level error is emitted.
Exceptions and Errors
Every call to a date/time function will generate a E_WARNING if the time zone is not valid. See also date_default_timezone_set
To generate a timestamp from a string representation of the date, you may be able to use strtotime. Additionally, some databases have functions to convert their date formats into timestamps (such as MySQL's UNIX_TIMESTAMP function).
Timestamp of the start of the request is available in $_SERVER['REQUEST_TIME'].
|timestamp is nullable now.