On Sun, May 29, 2011 at 10:35:08PM -0700, Jakub Narebski wrote:
> Anders Kaseorg <andersk@xxxxxxx> writes:
> > On Sun, 29 May 2011, Paul Mackerras wrote:
>
> > > > @@ -11018,7 +11018,18 @@ proc prefsok {} {
> > > > proc formatdate {d} {
> > > > global datetimeformat
> > > > if {$d ne {}} {
> > > > - set d [clock format [lindex $d 0] -format $datetimeformat]
> > > > + if {[string match {*%[zZ]*} $datetimeformat]} {
> > > > + if {[catch {set d [clock format [lindex $d 0] -timezone [lindex $d 1] -format $datetimeformat]}]} {
> > > > + # Tcl < 8.5 does not support -timezone.
> > > > + global env
> > > > + set zone [lindex $d 1]
> > > > + set env(TZ) "IDK[string range $zone 0 2]:[string range $zone 3 end]"
> > >
> > > What is this about? Where is the IDK prefix for timezones defined or
> > > described?
> >
> > Yeah, sorry, that deserved a bit more explanation. This is a kludge to
> > get Tcl 8.4 to format dates in the right timezone. IDK is an arbitrary
> > made up 3-letter code (âI Donât Knowâ), since a UTC offset canât generally
> > be converted into a zone name. The format of TZ is described at:
> > http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
> > http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html
> >
> > Actually, reading that again, I just realized that I need to invert the
> > sign. Also that it can be longer than 3 letters; Iâll use âUnknownâ
> > instead.
>
> Why not use UTC+N timezone (note: please check of for +HHMM it is
> UTC+HH or UTC-HH) for timezone with given numeric offset from
> Coordinated Universal Time?
>
> BTW. UTC because http://www.nist.gov/pml/div688/utcnist.cfm#cut
But what of half-hour offsets, in that case? A better idea would be
UTC+HHMM or UTC-HHMM. As an example, SA (CST) has a timezone of
UTC+0930.
Tim
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