The change to [UNTILYEAR [MONTH [DAY [TIME]]]] is much clearer for anyone parsing the file.
A few other items.
TYPE Gives the type of year in which the rule applies.
As far as I can tell, this is always "-". Might be nice to have a note indicating the last time this was necessary. (I hope it never becomes necessary to use in the future, since that makes the file unparseable by anything but zic.)
SAVE Gives the amount of time to be added to local
standard time when the rule is in effect. This
field has the same format as the AT field (although,
of course, the w and s suffixes are not used).
It doesn't mention the "u (or g or z)" suffixes. If those are also disallowed, they should be mentioned; or the text could be phrased as "of course, the letter suffixes are not used".
GMTOFF
The amount of time to add to UTC to get standard time
in this zone. This field has the same format as the
AT and SAVE fields of rule lines; begin the field with
a minus sign if time must be subtracted from UTC.
This is incorrect, since the AT and SAVE fields don't have the same format: I presume it is the SAVE format, so "AT and" should be deleted.
Mark
On 9/28/06, Olson, Arthur David (NIH/NCI) [E]
<olsona@dc37a.nci.nih.gov> wrote:
In early versions of the time zone package there was no support for
"UNTIL" stuff; lines of the same type always had the same number of