Re: drums2?

[Bruce Lilly <[e-mail]>]

Arnt Gulbrandsen wrote:
> So what should the correct limit be? What's the current range in use, 
> anyway - GMT-14 to GMT+15, or something like that?

Current range is (in 2822 notation) -1100 to +1400, according
to ftp://elsie.nci.nih.gov/pub/tzdata2002c.tar, with no offset
which is not a multiple of 15 minutes (that range and offset
characteristic has been true since 1980; the last -1130, -1200
and -1040 (not a multiple of 15 min.) were discontinued during
1979).  Since 1973 (when RFC 561 introduced Date:), -1200 to
+1400, with no offset which is not a multiple of either 10 or
15 minutes. Historically, prior to 1973 there were some with
offsets specified to the second, which the HHMM numeric offset
cannot handle.  The last such zone was in Liberia with an
offset of -0:44:30 and went out of use during 1972.

It would seem reasonable to support the offsets in effect
since RFC 561, which would be compatible with the HHMM offset
w/o introducing HHMMSS, and the normative text could require
that specified offsets correspond to some valid time zone as
of the specified date-time, much as is the case in 2822
section 3.3 w.r.t. valid time range (no 25:00), day vs. number
of days in the specified month (no 30 Feb), and correct
day-of-week.