[GEM Development] TZ Environment Variable and This Weekend

[Thomas Clayton]

Addenda:

> We'll see this weekend if YOU got the "Set TZ= ..." correct.
> 
> Me? I just intend to 'turn the clock' forward an hour,
>  the next time I turn it on, after the change occurs. 
> We keep REAL accurate time here! ;-)
> 
> (Hopefully the airlines, etc. don't do it MY way!)

What ME worry? ( <-- from a(n in)famous juvie mag.)

I'm just taking my monthly turn watching over the nuclear arsenal this
weekend. (Nice to have known you.)


(Un)sincerely,

Thomas Clayton

;-)
Good Luck, one and all.

--- Thomas Clayton <topcatdrc at yahoo.com> wrote:

> Dear Group:
> 
> Since you're all so advanced, this probably won't come as any
> surprise:
> Daylight Savings Time (DST) starts THIS weekend - NOT the last one of
> the month as WAS usual. There was some discussion of this on another
> list (POSSI) that I belong to. So I figured I just give you the
> 'gist'
> of solution here.
> 
> "
> While setting up EMX run-times on my computer - to TRY and get
> CD/Record to work (for use with UpDCD) - I noticed in the
> accompanying
> *.INF file the exact 'syntax' for the TZ environment variable. I'll
> state / post  it here because it is textual and (fairly) clear.
> 
> 
> >From ~~Eberhard Mathias's~~ EMXRT Inf file (with spacing,
> paragraphs,
> and two [inserts]  from me):
> 
> ""
> 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[.]
> 
>  [T]he 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.
> ""
> 
> "
> "
> I hope its all clear for everyone who needs it. 
> We'll see this weekend if YOU got the "Set TZ= ..." correct.
> 
> Me? I just intend to 'turn the clock' forward an hour,
>  the next time I turn it on, after the change occurs. 
> We keep REAL accurate time here! ;-)
> 
> (Hopefully the airlines, etc. don't do it MY way!)
> "
> 
> 
> Sincerely,
> 
> Thomas Clayton



 
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