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| == Format specifiers ==
| | Your post captures the issue prefectly! |
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| Excerpt from the [http://www.kernel.org/doc/man-pages/online/pages/man3/strftime.3.html strftime man page] (please note that not all format specifiers work on all platforms; meaning some do not work on for example Windows):
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| Ordinary characters placed in the format string are copied to the output without conversion. Conversion specifications are introduced by a '%' character, and terminated by a conversion specifier character, and are replaced in s as follows:
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| {| border=1 width=100%
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| |%a
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| |The abbreviated weekday name according to the current locale.
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| |-
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| |%A
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| |The full weekday name according to the current locale.
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| |-
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| |%b
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| |The abbreviated month name according to the current locale.
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| |-
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| |%B
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| |The full month name according to the current locale.
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| |-
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| |%c
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| |The preferred date and time representation for the current locale.
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| |-
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| |%C
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| |The century number (year/100) as a 2-digit integer. (SU)
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| |-
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| |%d
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| |The day of the month as a decimal number (range 01 to 31).
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| |-
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| |%D
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| |Equivalent to %m/%d/%y. (Yecch --- for Americans only. Americans should note that in other countries %d/%m/%y is rather common. This means that in international context this format is ambiguous and should not be used.) (SU)
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| |-
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| |%e
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| |Like %d, the day of the month as a decimal number, but a leading zero is replaced by a space. (SU)
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| |-
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| |%E
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| |Modifier: use alternative format, see below. (SU)
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| |-
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| |%F
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| |Equivalent to %Y-%m-%d (the ISO 8601 date format). (C99)
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| |-
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| |%G
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| |The ISO 8601 year with century as a decimal number. 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. (TZ)
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| |-
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| |%g
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| |Like %G, but without century, i.e., with a 2-digit year (00-99). (TZ)
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| |-
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| |%h
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| |Equivalent to %b. (SU)
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| |-
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| |%H
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| |The hour as a decimal number using a 24-hour clock (range 00 to 23).
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| |-
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| |%I
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| |The hour as a decimal number using a 12-hour clock (range 01 to 12).
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| |-
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| |%j
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| |The day of the year as a decimal number (range 001 to 366).
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| |-
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| |%k
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| |The hour (24-hour clock) as a decimal number (range 0 to 23); single digits are preceded by a blank. (See also %H.) (TZ)
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| |-
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| |%l
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| |The hour (12-hour clock) as a decimal number (range 1 to 12); single digits are preceded by a blank. (See also %I.) (TZ)
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| |-
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| |%m
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| |The month as a decimal number (range 01 to 12).
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| |-
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| |%M
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| |The minute as a decimal number (range 00 to 59).
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| |-
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| |%n
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| |A newline character. (SU)
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| |-
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| |%O
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| |Modifier: use alternative format, see below. (SU)
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| |-
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| |%p
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| |Either 'AM' or 'PM' according to the given time value, or the corresponding strings for the current locale. Noon is treated as 'pm' and midnight as 'am'.
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| |-
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| |%P
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| |Like %p but in lowercase: 'am' or 'pm' or a corresponding string for the current locale. (GNU)
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| |-
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| |%r
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| |The time in a.m. or p.m. notation. In the POSIX locale this is equivalent to '%I:%M:%S %p'. (SU)
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| |-
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| |%R
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| |The time in 24-hour notation (%H:%M). (SU) For a version including the seconds, see %T below.
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| |-
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| |%s
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| |The number of seconds since the Epoch, i.e., since 1970-01-01 00:00:00 UTC. (TZ)
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| |-
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| |%S
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| |The second as a decimal number (range 00 to 60). (The range is up to 60 to allow for occasional leap seconds.)
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| |-
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| |%t
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| |A tab character. (SU)
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| |-
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| |%T
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| |The time in 24-hour notation (%H:%M:%S). (SU)
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| |-
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| |%u
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| |The day of the week as a decimal, range 1 to 7, Monday being 1. See also %w. (SU)
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| |-
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| |%U
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| |The week number of the current year as a decimal number, range 00 to 53, starting with the first Sunday as the first day of week 01. See also %V and %W.
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| |-
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| |%V
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| |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. See also %U and %W. (SU)
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| |-
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| |%w
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| |The day of the week as a decimal, range 0 to 6, Sunday being 0. See also %u.
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| |-
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| |%W
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| |The week number of the current year as a decimal number, range 00 to 53, starting with the first Monday as the first day of week 01.
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| |-
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| |%x
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| |The preferred date representation for the current locale without the time.
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| |-
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| |%X
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| |The preferred time representation for the current locale without the date.
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| |-
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| |%y
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| |The year as a decimal number without a century (range 00 to 99).
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| |-
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| |%Y
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| |The year as a decimal number including the century.
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| |-
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| |%z
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| | The time-zone as hour offset from GMT. Required to emit RFC 822-conformant dates (using "%a, %d %b %Y %H:%M:%S %z"). (GNU)
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| |-
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| |%Z
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| |The time zone or name or abbreviation.
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| |-
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| |%%
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| |A literal '%' character.
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| |}
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