#	%%     a literal %
#	%a     locale's abbreviated weekday name (e.g., Sun)
#	%A     locale's full weekday name (e.g., Sunday)
#	%b     locale's abbreviated month name (e.g., Jan)
#	%B     locale's full month name (e.g., January)
#	%c     locale's date and time (e.g., Thu Mar  3 23:05:25 2005)
#	%C     century; like %Y, except omit last two digits (e.g., 20)
#	%d     day of month (e.g., 01)
#	%D     date; same as %m/%d/%y
#	%e     day of month, space padded; same as %_d
#	%F     full date; same as %Y-%m-%d
#	%g     last two digits of year of ISO week number (see %G)
#	%G     year of ISO week number (see %V); normally useful only with %V
#	%h     same as %b
#	%H     hour (00..23)
#	%I     hour (01..12)
#	%j     day of year (001..366)
#	%k     hour ( 0..23)
#	%l     hour ( 1..12)
#	%m     month (01..12)
#	%M     minute (00..59)
#	%n     a newline
#	%N     nanoseconds (000000000..999999999)
#	%p     locale's equivalent of either AM or PM; blank if not known
#	%P     like %p, but lower case
#	%r     locale's 12-hour clock time (e.g., 11:11:04 PM)
#	%R     24-hour hour and minute; same as %H:%M
#	%s     seconds since 1970-01-01 00:00:00 UTC
#	%S     second (00..60)
#	%t     a tab
#	%T     time; same as %H:%M:%S
#	%u     day of week (1..7); 1 is Monday
#	%U     week number of year, with Sunday as first day of week (00..53)
#	%V     ISO week number, with Monday as first day of week (01..53)
#	%w     day of week (0..6); 0 is Sunday
#	%W     week number of year, with Monday as first day of week (00..53)
#	%x     locale's date representation (e.g., 12/31/99)
#	%X     locale's time representation (e.g., 23:13:48)
#	%y     last two digits of year (00..99)
#	%Y     year
#	%z     +hhmm numeric time zone (e.g., -0400)
#	%:z    +hh:mm numeric time zone (e.g., -04:00)
#	%::z   +hh:mm:ss numeric time zone (e.g., -04:00:00)
#	%:::z  numeric  time  zone  with  :  to necessary precision (e.g., -04,+05:30)
#	%Z     alphabetic time zone abbreviation (e.g., EDT)
#
#	By default, date  pads  numeric  fields  with  zeroes.   The  following
#	optional flags may follow `%':
#
#	-      (hyphen) do not pad the field
#	_      (underscore) pad with spaces
#	0      (zero) pad with zeros
#	^      use upper case if possible
#	#      use opposite case if possible
#	After  any  flags  comes  an optional field width, as a decimal number;
#	then an optional modifier, which is either E to use the locale's alter‐
#	nate  representations  if available, or O to use the locale's alternate
#	numeric symbols if available.
#