Date/Time Functions in PHP

checkdate
-Validate a Gregorian date
date_add
- Alias of DateTime::add
date_create_from_format
- Alias of DateTime::createFromFormat
date_create
- Returns new DateTime object
date_date_set
-Alias of DateTime::setDate
date_default_timezone_get
-Gets the default timezone used by all date/time functions
in a script
date_default_timezone_set
-Sets the default timezone used by all date/time function
in a script
date_diff
-Alias of DateTime::diff
date_format
-Alias of DateTime::format
date_get_last_errors
-Alias of DateTime::getLastErrors
date_interval_create_from_date_string
-Alias of DateInterval::createFromDateString
date_interval_format
-Alias of DateInterval::format
date_isodate_set
-Alias of DateTime::setISODate
date_modify
-Alias of DateTime::modify
date_offset_get
-Alias of DateTime::getOffset
date_parse_from_format
-Get info about given date
date_parse
-Returns associative array with detailed info about
given date
date_sub
-Alias of DateTime::sub
date_sun_info
-Returns an array with information about sunset/sunrise,
twilight begin/end
date_sunrise
-Returns time of sunrise for a given day and location
date_sunset
-Returns time of sunset for a given day and location
date_time_set
-Alias of DateTime::setTime
date_timestamp_get
-Alias of DateTime::getTimestamp
date_timestamp_set
-Alias of DateTime::setTimestamp
date_timezone_get
-Alias of DateTime::getTimezone
date_timezone_set
-Alias of DateTime::setTimezone
date
-Format a local time/date
getdate
-Get date/time information
gettimeofday
-Get current time
gmdate
-Format a GMT/UTC date/time
gmmktime
-Get Unix timestamp for a GMT date
gmstrftime
-Format a GMT/UTC time/date according to locale settings
idate
-Format a local time/date as integer
localtime
-Get the local time
microtime
-Return current Unix timestamp with microseconds
mktime
-Get Unix timestamp for a date
strftime
-Format a local time/date according to locale settings
strptime
-Parse a time/date generated with strftime
strtotime
-Parse about any English textual datetime description into a
Unix timestamp
time
-Return current Unix timestamp
timezone_abbreviations_list
-Alias of DateTimeZone::listAbbreviations
timezone_identifiers_list
-Alias of DateTimeZone::listIdentifiers
timezone_location_get
-Alias of DateTimeZone::getLocation
timezone_name_from_abbr
-Returns the timezone name from abbrevation
timezone_name_get
-Alias of DateTimeZone::getName
timezone_offset_get
-Alias of DateTimeZone::getOffset
timezone_open
-Returns new DateTimeZone object
timezone_transitions_get
-Alias of DateTimeZone::getTransitions