Table of Contents

strftime

WMPRO, WMMINI FW >= 1.0 WMMEGA FW >= 2.0

Format a Linux Timestamp using a format string

Description

string strftime ( string $format, int $timestamp )

Parameters

$format: A string with Format Character Sequences which can also contain literal text

$timestamp: Seconds since January 1, 1970, 00:00:00, local Wattmon time

Return Values

Formatted string with all supported Format Character Sequences replaced with the converted value

Format Character Sequences

A Format Character Sequence (conversion specifier) is always 2 characters starting with a % character. Therefore, any text in the format string which is not preceded by a % character will be placed into the returned string as literal text, unchanged. Conversion specifiers are case-sensitive.

The following conversion specifiers may be used1) in the format string:

CategoryFormat CharactersDescriptionExample Return Values
Day%aAn abbreviated textual representation of the daySun through Sat
%AA full textual representation of the daySunday through Saturday
%dTwo-digit day of the month (with leading zeros)01 to 31
%eDay of the month, with a space preceding single digits.1 to 31
%jDay of the year, 3 digits with leading zeros001 to 366
%uISO-8601 numeric representation of the day of the week1 (for Monday) through 7 (for Sunday)
%wNumeric representation of the day of the week0 (for Sunday) through 6 (for Saturday)
Week%UWeek number of the given year, starting with the first Sunday as the first week13 (for the 13th full week of the year)
%VISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week01 through 53 (where 53 accounts for an overlapping week)
%WA numeric representation of the week of the year, starting with the first Monday as the first week46 (for the 46th week of the year beginning with a Monday)
Month%bAbbreviated month name, based on the localeJan through Dec
%BFull month name, based on the localeJanuary through December
%hAbbreviated month name, based on the locale (an alias of %b)Jan through Dec
%mTwo digit representation of the month01 (for January) through 12 (for December)
Year%CTwo digit representation of the century (year divided by 100, truncated to an integer)19 for the 20th Century
%gTwo digit representation of the year going by ISO-8601:1988 standards (see %V)09 for the week of January 6, 2009
%GThe full four-digit version of %g2008 for the week of January 3, 2009
%yTwo digit representation of the year09 for 2009, 79 for 1979
%YFour digit representation for the year2038
Time%HTwo digit representation of the hour in 24-hour format00 through 23
%kHour in 24-hour format, with a space preceding single digits0 through 23
%ITwo digit representation of the hour in 12-hour format01 through 12
%lHour in 12-hour format, with a space preceding single digits1 through 12
%MTwo digit representation of the minute00 through 59
%pUPPER-CASE 'AM' or 'PM' based on the given timeAM for 00:31, PM for 22:23
%Plower-case 'am' or 'pm' based on the given timeam for 00:31, pm for 22:23
%rSame as %I:%M:%S %p09:34:17 PM for 21:34:17
%RSame as %H:%M00:35 for 12:35 AM, 16:44 for 4:44 PM
%STwo digit representation of the second00 through 59
%TSame as %H:%M:%S21:34:17 for 09:34:17 PM
%XPreferred time representation based on locale, without the date03:59:16 or 15:59:16
%zThe time zone offset. Currently not supported on the Wattmon.-0500 for US Eastern Time
%ZThe time zone abbreviation. Currently not supported on the Wattmon.EST for Eastern Time
Time and Date Stamps%cPreferred date and time stamp based on localeTue Feb 5 00:45:10 2009 for February 5, 2009 at 12:45:10 AM
%DSame as %m/%d/%y02/05/09 for February 5, 2009
%FSame as %Y-%m-%d (commonly used in database datestamps)2009-02-05 for February 5, 2009
%sUnix Epoch Time timestamp (same as the time() function)305815200 for September 10, 1979 08:40:00 AM
%xPreferred date representation based on locale, without the time02/05/09 for February 5, 2009
Miscellaneous%nA newline character (“\n”)
%tA Tab character (“\t”)
%%A literal percentage character%

Notes

Unlike mainline PHP, in uPHP “Linux Timestamps” are based upon the Wattmon's local time, not UTC/GMT.

Technically, the Unix Epoch is defined as being January 1, 1970, 00:00:00 GMT. But on the Wattmon, timestamps are relative to January 1, 1970, 00:00:00 local timezone.

If the Wattmon clock and timezone are set to UTC+00 (GMT) then the uPHP timestamp is the same as mainline PHP, otherwise not.

In uPHP on the Wattmon this simplification is referred to as a “Linux Timestamp” but it should be noted that it may not be exactly the same, depending on the Wattmon's timezone settings.

In other words: Wattmon “Linux Timestamps” are based upon local Wattmon time and are not adjusted by the timezone setting in Control Panel > Time Settings (Time and Date Settings) > UTC Offset. (These settings are stored in /config/time.ini.)

See Also

microtime() - Return the number of milliseconds since boot

mktime() - Return the Linux Timestamp for a given date and time

settime() - Set the system time from a Linux Timestamp, with optional calibration

time() - Return the current system timestamp

timefromfat() - Convert a FAT filetime to a Linux Timestamp

uptime() - Return the uptime in milliseconds

1)
The Format Characters table is based upon the table at http://php.net/manual/en/function.strftime.php. Most of the conversion specifiers have been implemented on the Wattmon. However, some specifiers may not be supported as described, depending on the Wattmon hardware, firmware and operating system versions, and due to the limitations of the Wattmon system, which is purposely designed to fit into a very small memory footprint.