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 (“I Don’t Know”), since a UTC offset can’t 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; I’ll use “Unknown”
> 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
--
Jakub Narebski
Poland
ShadeHawk on #git
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