Support mail boxes that have dates without seconds (SysV) and those that have a timezone as <-|+>nnnn (eg. imapd).
Support mail boxes that have dates without seconds (SysV) and those
that have a timezone as <-|+>nnnn (eg. imapd).

PR:		bin/11746
Obtained from:	OpenBSD
MFC after:	2 weeks

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