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contrib/tzcode/tzfile.5
.\" This file is in the public domain, so clarified as of | .\" This file is in the public domain, so clarified as of | ||||
.\" 1996-06-05 by Arthur David Olson. | .\" 1996-06-05 by Arthur David Olson. | ||||
.\" | |||||
.\" $FreeBSD$ | |||||
.\" | |||||
.Dd December 15, 2022 | .Dd December 15, 2022 | ||||
.Dt TZFILE 5 | .Dt TZFILE 5 | ||||
.Os | .Os | ||||
.Sh NAME | .Sh NAME | ||||
.Nm tzfile | .Nm tzfile | ||||
.Nd timezone information | .Nd timezone information | ||||
.Sh DESCRIPTION | .Sh DESCRIPTION | ||||
The timezone information files used by | The timezone information files used by | ||||
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POSIX-TZ-environment-variable-style string for use in handling instants | POSIX-TZ-environment-variable-style string for use in handling instants | ||||
after the last transition time stored in the file | after the last transition time stored in the file | ||||
or for all instants if the file has no transitions. | or for all instants if the file has no transitions. | ||||
The POSIX-style TZ string is empty (i.e., nothing between the newlines) | The POSIX-style TZ string is empty (i.e., nothing between the newlines) | ||||
if there is no POSIX-style representation for such instants. | if there is no POSIX-style representation for such instants. | ||||
If nonempty, the POSIX-style TZ string must agree with the local time | If nonempty, the POSIX-style TZ string must agree with the local time | ||||
type after the last transition time if present in the eight-byte data; | type after the last transition time if present in the eight-byte data; | ||||
for example, given the string | for example, given the string | ||||
.Dq "WET0WEST,M3.5.0,M10.5.0/3" | .Dq "WET0WEST,M3.5.0/1,M10.5.0" | ||||
then if a last transition time is in July, the transition's local time | then if a last transition time is in July, the transition's local time | ||||
type must specify a daylight-saving time abbreviated | type must specify a daylight-saving time abbreviated | ||||
.Dq "WEST" | .Dq "WEST" | ||||
that is one hour east of UT. | that is one hour east of UT. | ||||
Also, if there is at least one transition, time type 0 is associated | Also, if there is at least one transition, time type 0 is associated | ||||
with the time period from the indefinite past up to but not including | with the time period from the indefinite past up to but not including | ||||
the earliest transition time. | the earliest transition time. | ||||
.Ss Version 3 format | .Ss Version 3 format | ||||
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