Specifies the mapping from the universal reference time
to local time.
The TZ environment variable is typically
specified in the ars.cfg file, and can also be
specified as an ENVAR LE runtime option in the PARM= value in
the ARSSOCKD STC.
The ars.cfg contains
this TZ value: TZ=EST5EDT
The
value of the
TZ environment variable has the
following fields:
- standard
- An alphabetic abbreviation for the local standard time zone. For
example: GMT, EST, MSEZ.
- HH[:MM[:SS]]
- The time offset westwards from the universal reference time. A
leading minus sign (-) means that the local time zone is east of the
universal reference time. An offset of this form must follow standard
and can also optionally follow daylight. An optional
colon (:) separates hours from optional minutes and seconds.
If daylight is
specified without a daylight offset, daylight savings
time is assumed to be one hour ahead of the standard time.
- [daylight]
- The abbreviation for your local daylight savings time zone. If
the daylight field is missing, Daylight Saving Time conversion is
disabled. The number of hours, minutes, and seconds your local Daylight
Savings Time is offset from UTC when Daylight Savings Time is in effect.
If the Daylight Savings Time abbreviation is specified, and the offset
omitted, the offset of one hour is assumed.
- [,startdate[/starttime],enddate[/endtime]]
- A rule that identifies the start and end of Daylight Savings Time,
specifying when Daylight Savings Time should be in effect. Both the startdate and enddate must
be present, and must either take the form Jn, n,
or Mm.n.d..
- Jn is the Julian day n (1 <= n <=365)
and does not account for leap days.
- n is the zero-based Julian day (0 <= n <=
365). Leap days are counted; therefore, you can refer to February
29th.
- Mm.w.d defines
the day (0 <= d <= 6) of week w (1 <= w <=
5) of month m (1 <= 12) of the year. Week 5
has the last day (d) in month m,
which might occur in either the fourth or fifth week. Week 1 is the
first week in which the dth day occurs. Day zero
is Sunday.
Neither starttime nor endtime are
required. If they are omitted, their values default to 02:00:00. If
this Daylight Savings Time rule is omitted altogether, the values
in the rule default to the standard American Daylight Savings Time
rules starting at 02:00:00 the first Sunday in April and ending at
02:00:00 the last Sunday in October. When the TZ environment
variable is not set, time conversions behave as if TZ were set to
GMT0 (TZ=GMT0).