Specifications

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corresponding strings for the current locale. Noon is treated as pm and
midnight as am.
%P
Like %p but in lowercase: am or pm or a corresponding string for the current
locale. (GNU)
%r
The time in a.m. or p.m. notation. In the POSIX locale this is
equivalent to %I:%M:%S %p. (SU)
%R
The time in 24-hour notation (%H:%M). (SU) For a version including the
seconds, see %T below.
%s
The number of seconds since the Epoch, i.e., since 1970-01-01 00:00:00 UTC.
(TZ)
%S
The second as a decimal number (range 00 to 60). (The range is up to 60 to
allow for occasional leap seconds.)
%t
A tab character. (SU)
%T
The time in 24-hour notation (%H:%M:%S). (SU)
%u
The day of the week as a decimal, range 1 to 7, Monday being 1.See also %w.
(SU)
%U
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.
%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. See also %U and %
W. (SU)
%w
The day of the week as a decimal, range 0 to 6, Sunday being 0.See also %u.
%W
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.
%x
The preferred date representation for the current locale without the
time.
%X
The preferred time representation for the current locale without the date.
%y
The year as a decimal number without a century (range 00 to 99).
%Y
The year as a decimal number including the century.
%z
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)
%Z
The time zone or name or abbreviation.
%+
The date and time in date (1) format. (TZ)
%%
A literal % character
Table 4.3