Date/time checkdate Validate a gregorian date/time boolcheckdate intmonth intday intyear Returns &true; if the date given is valid; otherwise returns &false;. Checks the validity of the date formed by the arguments. A date is considered valid if: year is between 1 and 32767 inclusive month is between 1 and 12 inclusive Day is within the allowed number of days for the given month. Leap years are taken into consideration. See also mktime and strtotime. date Format a local time/date stringdate stringformat int timestamp Returns a string formatted according to the given format string using the given integer timestamp or the current local time if no timestamp is given. The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer.) 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). The following characters are recognized in the format string: a - "am" or "pm" A - "AM" or "PM" B - Swatch Internet time d - day of the month, 2 digits with leading zeros; i.e. "01" to "31" D - day of the week, textual, 3 letters; i.e. "Fri" F - month, textual, long; i.e. "January" g - hour, 12-hour format without leading zeros; i.e. "1" to "12" G - hour, 24-hour format without leading zeros; i.e. "0" to "23" h - hour, 12-hour format; i.e. "01" to "12" H - hour, 24-hour format; i.e. "00" to "23" i - minutes; i.e. "00" to "59" I (capital i) - "1" if Daylight Savings Time, "0" otherwise. j - day of the month without leading zeros; i.e. "1" to "31" l (lowercase 'L') - day of the week, textual, long; i.e. "Friday" L - boolean for whether it is a leap year; i.e. "0" or "1" m - month; i.e. "01" to "12" M - month, textual, 3 letters; i.e. "Jan" n - month without leading zeros; i.e. "1" to "12" O - Difference to Greenwich time in hours; i.e. "+0200" r - RFC 822 formatted date; i.e. "Thu, 21 Dec 2000 16:01:07 +0200" (added in PHP 4.0.4) s - seconds; i.e. "00" to "59" S - English ordinal suffix for the day of the month, 2 characters; i.e. "th", "nd" t - number of days in the given month; i.e. "28" to "31" T - Timezone setting of this machine; i.e. "MDT" U - seconds since the epoch w - day of the week, numeric, i.e. "0" (Sunday) to "6" (Saturday) W - ISO-8601 week number of year, weeks starting on monday (added in PHP 4.1.0) (Saturday) Y - year, 4 digits; i.e. "1999" y - year, 2 digits; i.e. "99" z - day of the year; i.e. "0" to "365" Z - timezone offset in seconds (i.e. "-43200" to "43200"). The offset for timezones west of UTC is always negative, and for those east of UTC is always positive. Unrecognized characters in the format string will be printed as-is. The "Z" format will always return "0" when using gmdate. You can prevent a recognized character in the format string from being expanded by escaping it with a preceding backslash. If the character with a backslash is already a special sequence, you may need to also escape the backslash. It is possible to use date and mktime together to find dates in the future or the past. This can be more reliable than simply adding or subtracting the number of seconds in a day or month to a timestamp because of daylight savings time. Some examples of date formatting. Note that you should escape any other characters, as any which currently have a special meaning will produce undesirable results, and other characters may be assigned meaning in future PHP versions. When escaping, be sure to use single quotes to prevent characters like \n from becoming newlines. To format dates in other languages, you should use the setlocale and strftime functions. See also getlastmod, gmdate, mktime, strftime and time. getdate Get date/time information arraygetdate inttimestamp Returns an associative array containing the date information of the timestamp, or the current local time if no timestamp is given, as the following array elements: "seconds" - seconds "minutes" - minutes "hours" - hours "mday" - day of the month "wday" - day of the week, numeric : from 0 as Sunday up to 6 as Saturday "mon" - month, numeric "year" - year, numeric "yday" - day of the year, numeric; i.e. "299" "weekday" - day of the week, textual, full; i.e. "Friday" "month" - month, textual, full; i.e. "January" gettimeofday Get current time arraygettimeofday This is an interface to gettimeofday(2). It returns an associative array containing the data returned from the system call. "sec" - seconds "usec" - microseconds "minuteswest" - minutes west of Greenwich "dsttime" - type of dst correction gmdate Format a GMT/CUT date/time stringgmdate stringformat inttimestamp Identical to the date function except that the time returned is Greenwich Mean Time (GMT). For example, when run in Finland (GMT +0200), the first line below prints "Jan 01 1998 00:00:00", while the second prints "Dec 31 1997 22:00:00". See also date, mktime, gmmktime and strftime. gmmktime Get UNIX timestamp for a GMT date intgmmktime inthour intminute intsecond intmonth intday intyear intis_dst Identical to mktime except the passed parameters represents a GMT date. gmstrftime Format a GMT/CUT time/date according to locale settings stringgmstrftime stringformat inttimestamp Behaves the same as strftime except that the time returned is Greenwich Mean Time (GMT). For example, when run in Eastern Standard Time (GMT -0500), the first line below prints "Dec 31 1998 20:00:00", while the second prints "Jan 01 1999 01:00:00". See also strftime. localtime Get the local time arraylocaltime int timestamp bool is_associative The localtime function returns an array identical to that of the structure returned by the C function call. The first argument to localtime is the timestamp, if this is not given the current time is used. The second argument to the localtime is the is_associative, if this is set to 0 or not supplied than the array is returned as a regular, numerically indexed array. If the argument is set to 1 then localtime is an associative array containing all the different elements of the structure returned by the C function call to localtime. The names of the different keys of the associative array are as follows: "tm_sec" - seconds "tm_min" - minutes "tm_hour" - hour "tm_mday" - day of the month "tm_mon" - month of the year, starting with 0 for January "tm_year" - Years since 1900 "tm_wday" - Day of the week "tm_yday" - Day of the year "tm_isdst" - Is daylight savings time in effect microtime Return current UNIX timestamp with microseconds stringmicrotime Returns the string "msec sec" where sec is the current time measured in the number of seconds since the Unix Epoch (0:00:00 January 1, 1970 GMT), and msec is the microseconds part. This function is only available on operating systems that support the gettimeofday() system call. Both portions of the string are returned in units of seconds. See also time. mktime Get UNIX timestamp for a date intmktime inthour intminute intsecond intmonth intday intyear intis_dst Warning: Note the strange order of arguments, which differs from the order of arguments in a regular UNIX mktime() call and which does not lend itself well to leaving out parameters from right to left (see below). It is a common error to mix these values up in a script. Returns the Unix timestamp corresponding to the arguments given. This timestamp is a long integer containing the number of seconds between the Unix Epoch (January 1 1970) and the time specified. Arguments may be left out in order from right to left; any arguments thus omitted will be set to the current value according to the local date and time. is_dst can be set to 1 if the time is during daylight savings time, 0 if it is not, or -1 (the default) if it is unknown whether the time is within daylight savings time or not. If it's unknown, PHP tries to figure it out itself. This can cause unexpected (but not incorrect) results. is_dst was added in 3.0.10. mktime is useful for doing date arithmetic and validation, as it will automatically calculate the correct value for out-of-range input. For example, each of the following lines produces the string "Jan-01-1998". Year may be a two or four digit value, with values between 0-69 mapping to 2000-2069 and 70-99 to 1970-1999 (on systems where time_t is a 32bit signed integer, as most common today, the valid range for year is somewhere between 1902 and 2037). The last day of any given month can be expressed as the "0" day of the next month, not the -1 day. Both of the following examples will produce the string "The last day in Feb 2000 is: 29". Date with year, month and day equal to zero is considered illegal (otherwise it what be regarded as 30.11.1999, which would be strange behavior). See also date and time. strftime Format a local time/date according to locale settings stringstrftime stringformat int timestamp Returns a string formatted according to the given format string using the given timestamp or the current local time if no timestamp is given. Month and weekday names and other language dependent strings respect the current locale set with setlocale. The following conversion specifiers are recognized in the format string: %a - abbreviated weekday name according to the current locale %A - full weekday name according to the current locale %b - abbreviated month name according to the current locale %B - full month name according to the current locale %c - preferred date and time representation for the current locale %C - century number (the year divided by 100 and truncated to an integer, range 00 to 99) %d - day of the month as a decimal number (range 01 to 31) %D - same as %m/%d/%y %e - day of the month as a decimal number, a single digit is preceded by a space (range ' 1' to '31') %g - like %G, but without the century. %G - The 4-digit year corresponding to the ISO week number (see %V). This has the same format and value as %Y, except that if the ISO week number belongs to the previous or next year, that year is used instead. %h - same as %b %H - hour as a decimal number using a 24-hour clock (range 00 to 23) %I - hour as a decimal number using a 12-hour clock (range 01 to 12) %j - day of the year as a decimal number (range 001 to 366) %m - month as a decimal number (range 01 to 12) %M - minute as a decimal number %n - newline character %p - either `am' or `pm' according to the given time value, or the corresponding strings for the current locale %r - time in a.m. and p.m. notation %R - time in 24 hour notation %S - second as a decimal number %t - tab character %T - current time, equal to %H:%M:%S %u - weekday as a decimal number [1,7], with 1 representing Monday Sun Solaris seems to start with Sunday as 1 although ISO 9889:1999 (the current C standard) clearly specifies that it should be Monday. %U - week number of the current year as a decimal number, starting with the first Sunday as the first day of the first week %V - The ISO 8601:1988 week number of the current year as a decimal number, range 01 to 53, where week 1 is the first week that has at least 4 days in the current year, and with Monday as the first day of the week. (Use %G or %g for the year component that corresponds to the week number for the specified timestamp.) %W - week number of the current year as a decimal number, starting with the first Monday as the first day of the first week %w - day of the week as a decimal, Sunday being 0 %x - preferred date representation for the current locale without the time %X - preferred time representation for the current locale without the date %y - year as a decimal number without a century (range 00 to 99) %Y - year as a decimal number including the century %Z - time zone or name or abbreviation %% - a literal `%' character Not all conversion specifiers may be supported by your C library, in which case they will not be supported by PHP's strftime. This means that %T and %D will not work on Windows. This example works if you have the respective locales installed in your system. See also setlocale and mktime and the Open Group specification of strftime. time Return current UNIX timestamp inttime Returns the current time measured in the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT). See also date. strtotime Parse about any English textual datetime description into a UNIX timestamp intstrtotime stringtime intnow The function expects to be given a string containing an English date format and will try to parse that format into a UNIX timestamp relative to the timestamp given in now, or the current time if none is supplied. Upon failure, -1 is returned. Because strtotime behaves according to GNU date syntax, have a look at the GNU manual page titled Date Input Formats. Described there is valid syntax for the time parameter. The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer.)