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tztab(4) [hpux man page]

tztab(4)						     Kernel Interfaces Manual							  tztab(4)

tztab - time zone adjustment table for date and ctime() DESCRIPTION
The file describes the differences between Coordinated Universal Time (UTC) and local time. Several local areas can be represented simul- taneously 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 number 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. EXTERNAL INFLUENCES
International Code Set Support Single-byte character code sets are supported. EXAMPLES
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). AUTHOR
was developed by HP. FILES
date(1), ctime(3C), environ(5). tztab(4)

Check Out this Related Man Page

zic(1M) 																   zic(1M)

zic - time zone compiler SYNOPSIS
zic [-s] [-v] [-l localtime] [-p posixrules] [-d directory] [-y yearistype] [filename...] zic reads text from the file(s) named on the command line and creates the time conversion information files specified in this input. If a filename is '-', the standard input is read. Input lines are made up of fields. Fields are separated by any number of white space characters. Leading and trailing white space on input lines is ignored. A pound sign (#) indicates a comment that extends to the end of the line. White space characters and pound signs can be enclosed within double quotes (" ") if they are to be used as part of a field. Any line that is blank (after comment stripping) is ignored. Non-blank lines are expected to be of one of three types: rule lines, zone lines, or link lines. Rule A rule line has the form: For example: Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S The fields that make up a rule line are: Rule USA 1969 1973 - Apr lastSun 2:00 1:00 D NAME Gives the (arbitrary) name of the set of rules this rule is part of. FROM Gives the first year in which the rule applies. The word minimum (or an abbreviation) means the minimum year with a repre- sentable time value. The word maximum (or an abbreviation) means the maximum year with a representable time value. TO Gives the final year in which the rule applies. In addition to minimum and maximum (as above), the word only (or an abbre- viation) can be used to repeat the value of the FROM field. TYPE Gives the type of year in which the rule applies. If TYPE is: '-' The rule applies in all years between FROM and TO, inclusive. uspres The rule applies in U.S. Presidential election years. nonpres The rule applies in years other than U.S. Presidential election years. even The rule applies to even-numbered years. odd The rule applies to odd-numbered years. If TYPE is something else, then zic will attempt to execute the command yearistype year type to check the type of a year: an exit status of 0 means that the year is of the given type; an exit status of 1 means that the year is not of the given type. The yearistype command is not currently provided in the Solaris environment. IN Names the month in which the rule takes effect. Month names can be abbreviated. ON Gives the day on which the rule takes effect. Recognized forms include: 5 the fifth day of the month lastSun The last Sunday in the month lastMon The last Monday in the month Sun>=8 First Sunday on or after the eighth Sun<=25 Last Sunday on or before the 25th Names of days of the week can be abbreviated or spelled out in full. Note: There cannot be spaces within the ON field. AT Gives the time of day at which the rule takes effect. Recognized forms include: 2 Time in hours 2:00 Time in hours and minutes 15:00 24-hour format time (for times after noon) 1:28:14 Time in hours, minutes, and seconds, where hour 0 is midnight at the start of the day and hour 24 is mid- night at the end of the day. Any of these forms can be followed by the letter w if the given time is local "wall clock" time; s if the given time is local "standard" time; or u (or g or z) if the given time is universal time. In the absence of an indicator, wall clock time is assumed. SAVE Gives the amount of time to be added to local standard time when the rule is in effect. This field has the same format as the AT field (without the w and s suffixes). LETTER/S Gives the "variable part" (for example, the "S" or "D" in "EST" or "EDT" of time zone abbreviations to be used when this rule is in effect. If this field is '-', the variable part is null. Zone A zone line has the form: Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] For example: Zone Australia/SouthWest 9:30 - CST 1992 Mar 15 12:00 8:30 Aus CST The fields that make up a zone line are: NAME The name of the time zone. This is the name used in creating the time conversion information file for the zone. GMTOFF The amount of time to add to UTC to get standard time in this zone. This field has the same format as the AT and SAVE fields of rule lines; begin the field with a minus sign to subtract time from UTC. RULES/SAVE The name of the rule(s) that apply in the time zone or, alternately, an amount of time to add to local standard time. If this field is `-', then standard time always applies in the time zone. FORMAT The format for time zone abbreviations in this time zone. The pair of characters %s is used to show where the "variable part" of the time zone abbreviation goes. Alternately, a slash (/) separates standard and daylight abbreviations. UNTIL The time at which the UTC offset or the rule(s) change for a location. It is specified as a year, a month, a day, and a time of day. The time of day has the same format as the AT field of rule lines. If this is specified, the time zone infor- mation is generated from the given UTC offset and rule change until the time specified. The month, day, and time of day have the same format as the IN, ON, and AT columns of a rule; trailing columns can be omit- ted, and default to the earliest possible value for the missing columns. The next line must be a "continuation" line. This line has the same form as a zone line except that the string "Zone" and the name are omitted. The continuation line places information starting at the time specified as the UNTIL field in the previous line in the file used by the previous line. Continuation lines can contain an UNTIL field, just as zone lines do, indicating that the next line is a further continuation. Link A link line has the form: Link LINK-FROM LINK-TO For example: Link Europe/Istanbul Asia/Istanbul The LINK-FROM field should appear as the NAME field in some zone line; the LINK-TO field is used as an alternate name for that zone. Except for continuation lines, lines can appear in any order in the input. -d directory Creates time conversion information files in the directory directory rather than in the standard directory /usr/share/lib/zoneinfo. -l localtime Uses the given time zone as local time localtime. zic acts as if the file contained a link line of the form: Link localtime localtime -p posixrules Uses the rules of the given time zone posixrules when handling POSIX-format time zone environment variables. zic acts as if the input contained a link line of the form: Link posixrules posixrules This option is not used by ctime(3C) and mktime(3C) in the Solaris environment. -s Limits time values stored in output files to values that are the same whether they are taken to be signed or unsigned. You can use this option to generate SVVS-compatible files. -v Complains if a year that appears in a data file is outside the range of years representable by system time values (0:00:00 a.m. UTC, January 1, 1970, to 3:14:07 a.m. UTC, January 19, 2038). -y yearistype Uses the given command yearistype rather than yearistype when checking year types (see Rules under DESCRIPTION). filename A file containing input lines that specify the time conversion information files to be created. If a filename is '-', the standard input is read. /usr/share/lib/zoneinfo Standard directory used for created files /usr/share/lib/zoneinfo/src Directory containing source files See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ time(1), zdump(1M), ctime(3C), mktime(3C), attributes(5) For areas with more than two types of local time, you might need to use local standard time in the AT field of the earliest transition time's rule to ensure that the earliest transition time recorded in the compiled file is correct. 1 Dec 1998 zic(1M)
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