tztab man page on HP-UX

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tztab(4)							      tztab(4)

       tztab - time zone adjustment table for date and ctime()

       The  file  describes the differences between Coordinated Universal Time
       (UTC) and local time.  Several local areas can be represented  simulta‐
       neously with historical detail.

       The  file  consists  of	one or more time zone adjustment entries.  The
       first line of the entry contains a unique string	 that  may  match  the
       value  of the string in the user's environment.	The format is where is
       the time zone name or abbreviation, diff is  the	 difference  in	 hours
       from  UTC,  and	is  the name or abbreviation of the "Daylight Savings"
       time zone.  Fractional values of diff are expressed in minutes preceded
       by a colon.  Each such string will start with an alphabetic character.

       The  second  and	 subsequent  lines of each entry details the time zone
       adjustments for that time zone.	The lines contain seven	 fields	 each.
       The  first  six	fields specify the first minute in which the time zone
       adjustment, specified in the seventh field, applies.   The  fields  are
       separated  by  spaces or tabs.  The first six are integer patterns that
       specify the minute (0-59), hour (0-23), day of the month (1-31),	 month
       of  the	year  (1-12), year (1970-2038), and day of the week (0-6, with
       0=Sunday).  The minute, hour, and month of the year must contain a num‐
       ber  in	the (respective) range indicated above.	 The day of the month,
       year, and day of the week can contain a number as above or two  numbers
       separated  by  a minus (indicating an inclusive range).	Either the day
       of the month or the day of the week field must be a  range,  the	 other
       must be simple number.

       The  seventh  field is a string that describes the time zone adjustment
       in its simplest form: where is an alphabetic  string  giving  the  time
       zone  name  or  abbreviation,  and diff is the difference in hours from
       UTC.  must match either the field or the field in the first line of the
       time zone adjustment entry.  Any fractional diff is shown in minutes.

       Comments	 begin	with a in the first column, and include all characters
       up to a newline.	 Comments are ignored.

   International Code Set Support
       Single-byte character code sets are supported.

       The time zone adjustment table for the Eastern Time Zone in the	United
       States is:

       Normally (as indicated in the first line) Eastern Standard Time is five
       hours earlier than UTC.	During Daylight Savings time, it changes to  a
       4  hour	difference.   The first time Daylight Savings Time took effect
       (second line) was on January 6, 1974 at 3:00 a.m., EDT.	Note that  the
       minute  before  was  1:59  a.m., EST.  The change back to standard time
       took effect (sixth line) on the last Sunday in  November	 of  the  same
       year.   At  that point, the time went from 1:59 a.m., EDT to 1:00 a.m.,
       EST.  The transition to Daylight Savings Time since then has gone  from
       the  last  Sunday  in February (third line) to the last Sunday in April
       (fourth line) to the first Sunday in April (fifth line).	 The return to
       standard	 time  for  the same period has remained at the last Sunday in
       October (seventh line).

       was developed by HP.

       date(1), ctime(3C), environ(5).


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