TZ... Again

[Alexander Sarras]

On Sun, 26 Mar 2000 11:48:54 -0800, Marty Abrego wrote:

> 
> I hate to bring up a potentially explosive topic (well, maybe not),
> but this should be an easily answered question.  During the previous
> TZ discussion, I think someone posted the long-form of the TZ
> variable for OS/2 -- you know, the one that says exactly what date
> and time to change to DST?  I searched through the old mail, but I
> couldn't find it.
> 
> The thing is, today we are on DST, but OS/2 didn't change.  That's
> "normal", except that I am running Timekeeper/2 and I thought it
> would handle it.  It didn't, but I think it might have if it had the
> long-form instead of "pst8pdt" for TZ.  Anyone remember the long
> version??

This is thee most comprehensive explanation I've got.
From the user's guide to the emx Runtime:
>    
>   The TZ environment variable controls how to compute Coordinated Universal Time (UTC aka GMT) from local 
>   time.  (Note that under Unix, TZ is used for computing local time from UTC as UTC is used for the system clock 
>   under Unix; under OS/2 and DOS, local time is used for the system clock.) 
> 
>   The value of TZ has the following format: 
> 
>       TZ1[OFF,[TZ2[,SM,SW,SD,ST,EM,EW,ED,ET,SHIFT]]] 
> 
>   TZ1 is the three-letter name of the standard timezone. 
> 
>   OFF is the offset to Coordinated Universal Time; positive values are to the west of the Prime Meridian, negative 
>   values are to the east of the Prime Meridian.  The offset can be specified as hours, hours and minutes, or hours, 
>   minutes, and seconds.  Hours, minutes, and seconds are separated by colons.  If OFF is not specified, an offset 
>   of 0 will be used (this may change in the future). 
> 
>   TZ2 is the three-letter name of the summer timezone (daylight saving time).  If TZ2 is not specified, daylight 
>   saving time does not apply.  If TZ2 is specified, daylight saving time does apply; the remainder of the TZ's value 
>   specifies when and how to change to and back from daylight saving time.  SM through ST define, in current 
>   local time, when to switch from standard time to daylight saving time, EM through ET define, in current local 
>   time, when to switch from daylight saving time to standard time.  (On the southern hemisphere, the end date 
>   precedes the start date.)  SHIFT is the amount of change in seconds. 
> 
>   SM specifies the month (1 through 12) of the change.  SW specifies the week of the change; if this value is 
>   zero, SD specifies the day of month (1 through 31).  If SW is positive (1 through 4), the change occurs on 
>   weekday SD (0=Sunday through 6=Saturday) of the SWth week of the specified month.  The first week of a 
>   month starts on the first Sunday of the month.  If SW is negative (-1 through -4), the change occurs on 
>   weekday SD (0=Sunday through 6=Saturday) of the -SWth week of the specified month, counted from the end 
>   of the month (that is, -1 specifies the last week of the month).  The last week of a month starts on the last 
>   Sunday of the month.  ST specifies the time of the change, in seconds.  Note that ST is specified in local 
>   standard time and ET is specified in local daylight saving time.  Example: 
> 
>       CET-1CED,3,-1,0,7200,10,-1,0,10800,3600
>       
>   In this example, the name of the standard time zone is CET, the name of the summer time zone is CED.  
>   Daylight saving time starts at 2:00 on the last Sunday of March and ends at 3:00 on the last Sunday of October.  
>   Time changes by one hour in daylight saving time. 
> 
>   If no characters follow TZ2, the rule `,4,1,0,3600,10,-1,0,7200,3600' will be used: Daylight saving 
>   time starts at 1:00 on the first Sunday of April and ends at 2:00 on the last Sunday of October.  Time changes 
>   by one hour in daylight saving time. 
> 

Good luck
SaS
-- 
       Dr. Alexander Sarras         |     * Trouble * IS my middle name!
  www.sarras.at     mail@sarras.at  |           The TroubleShooter
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