https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248918
Bug ID: 248918
Summary: date(1) -f uses current time for unspecified
components
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: ema...@freebsd.org
Date's -j and -f flags can be used together to specify a date, in an arbitrary
format, to convert it to a different format. The man page gives
% date -j -f "%a %b %d %T %Z %Y" "`date`" "+%s"
as an example to convert a string in date's usual output format to an epoch
timestamp.
If the -j and -f flags are used without specifying all components of struct tm
the unspecified components keep their current values:
% date -j -f %Y-%m-%d 2021-09-30 +%s; sleep 5; date -j -f %Y-%m-%d 2021-09-30
+%s
1633047180
1633047185
This is behaviour is surprising; it's useful for -f alone (the user might want
to change the time but leave the date alone, for example), but seems like -j
should start with all components zeroed.
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