The date/time functions allow you to get the date and time from the server where your PHP script runs. You can then use the date/time functions to format the date and time in several ways.
Note: These functions depend on the locale settings of your server. Remember to take daylight saving time and leap years into consideration when working with these functions.
PHP 5 Date/Time Functions
checkdate():- Validates a Gregorian date
date_add():- Adds days, months, years, hours, minutes, and seconds to a date
date_create_from_format() :-Returns a new DateTime object formatted according to a specified format
date_create() :-Returns a new DateTime object
date_date_set():- Sets a new date
date_default_timezone_get():- Returns the default timezone used by all date/time functions
date_default_timezone_set() :-Sets the default timezone used by all date/time functions
date_diff() :-Returns the difference between two dates
date_format():- Returns a date formatted according to a specified format
date_get_last_errors():- Returns the warnings/errors found in a date string
date_interval_create_from_date_string():- Sets up a Date Interval from the relative parts of the string
date_interval_format() :-Formats the interval
date_isodate_set() :-Sets the ISO date
date_modify():- Modifies the timestamp
date_offset_get():- Returns the timezone offset
date_parse_from_format():- Returns an associative array with detailed info about a specified date, according to a specified format
date_parse():- Returns an associative array with detailed info about a specified date
date_sub() :-Subtracts days, months, years, hours, minutes, and seconds from a date
date_sun_info():- Returns an array containing info about sunset/sunrise and twilight begin/end, for a specified day and location
date_sunrise():- Returns the sunrise time for a specified day and location
date_sunset():- Returns the sunset time for a specified day and location
date_time_set():- Sets the time
date_timestamp_get():- Returns the Unix timestamp
date_timestamp_set() :-Sets the date and time based on a Unix timestamp
date_timezone_get():- Returns the time zone of the given DateTime object
date_timezone_set():- Sets the time zone for the DateTime object
date():- Formats a local date and time
getdate():- Returns date/time information of a timestamp or the current local date/time
gettimeofday():- Returns the current time
gmdate():- Formats a GMT/UTC date and time
gmmktime():- Returns the Unix timestamp for a GMT date
gmstrftime():- Formats a GMT/UTC date and time according to locale settings
idate():- Formats a local time/date as integer
localtime():- Returns the local time
microtime():- Returns the current Unix timestamp with microseconds
mktime():- Returns the Unix timestamp for a date
strftime():- Formats a local time and/or date according to locale settings
strptime():- Parses a time/date generated with strftime()
strtotime():- Parses an English textual datetime into a Unix timestamp
time():- Returns the current time as a Unix timestamp
timezone_abbreviations_list():- Returns an associative array containing dst, offset, and the timezone name
timezone_identifiers_list():- Returns an indexed array with all timezone identifiers
timezone_location_get():- Returns location information for a specified timezone
timezone_name_from_ abbr():- Returns the timezone name from abbreviation
timezone_name_get():- Returns the name of the timezone
timezone_offset_get():- Returns the timezone offset from GMT
timezone_open():- Creates new DateTimeZone object
timezone_transitions_get():- Returns all transitions for the timezone
timezone_version_get():- Returns the version of the timezone db
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