1Usage: datesort [OPTION]... [FILE]...
2
3Sort contents of FILE chronologically.
4If FILE is omitted read from stdin.
5
6The first date/time value per line is the sort key.  Dates without times
7account for a smaller value than any date/time on the same day.  Times
8without dates account for a smaller value than any date or date/time.
9If a line contains no dates or times or date/times it is sorted towards
10the front.
11
12  -h, --help                 Print help and exit
13  -V, --version              Print version and exit
14  -i, --input-format=STRING...  Input format, can be used multiple times.
15                               Each date/time will be passed to the input
16                               format parsers in the order they are given, if a
17                               date/time can be read successfully with a given
18                               input format specifier string, that value will
19                               be used.
20  -b, --base=DT              For underspecified input use DT as a fallback to
21                             fill in missing fields.  Also used for ambiguous
22                             format specifiers to position their range on the
23                             absolute time line.
24                             Must be a date/time in ISO8601 format.
25                             If omitted defaults to the current date/time.
26  -e, --backslash-escapes    Enable interpretation of backslash escapes in the
27                               input format specifier strings.
28      --from-locale=LOCALE   Interpret dates on stdin or the command line as
29                             coming from the locale LOCALE, this would only
30                             affect month and weekday names as input formats
31                             have to be specified explicitly.
32      --from-zone=ZONE       Interpret dates on stdin or the command line as
33                               coming from the time zone ZONE.
34
35  -r, --reverse              Reverse the sort order.
36  -u, --unique               Print at most one line per date/time value.