This file is in the public domain, so clarified as of
2009-05-17 by Arthur David Olson.
tzselect - select a timezone . if \n(.g .if c \(de .if c \(fm .if c \(sd \{\ . ds d \(de . ds m \(fm . ds s \(sd . ds _ \| . \} .\} tzselect [ \*-c coord ] [ \*-n limit ] [ \*-\*-help ] [ \*-\*-version ] The tzselect program asks the user for information about the current location, and outputs the resulting timezone to standard output. The output is suitable as a value for the TZ environment variable.

All interaction with the user is done via standard input and standard error.

"\*-c " coord Instead of asking for continent and then country and then city, ask for selection from time zones whose largest cities are closest to the location with geographical coordinates coord. Use ISO 6709 notation for coord, that is, a latitude immediately followed by a longitude. The latitude and longitude should be signed integers followed by an optional decimal point and fraction: positive numbers represent north and east, negative south and west. Latitudes with two and longitudes with three integer digits are treated as degrees; latitudes with four or six and longitudes with five or seven integer digits are treated as "DDMM, DDDMM, DDMMSS," or DDDMMSS representing DD or DDD degrees, MM minutes, and zero or SS seconds, with any trailing fractions represent fractional minutes or (if SS is present) seconds. The decimal point is that of the current locale. For example, in the (default) C locale, "\*-c +40.689\*-074.045" specifies 40.689\*d\*_N, 74.045\*d\*_W, "\*-c +4041.4\*-07402.7" specifies 40\*d\*_41.4\*m\*_N, 74\*d\*_2.7\*m\*_W, and "\*-c +404121\*-0740240" specifies 40\*d\*_41\*m\*_21\*s\*_N, 74\*d\*_2\*m\*_40\*s\*_W. If coord is not one of the documented forms, the resulting behavior is unspecified.

"\*-n " limit When \*-c is used, display the closest limit locations (default 10).

"\*-\*-help" Output help information and exit.

"\*-\*-version" Output version information and exit.

\f3AWK Name of a POSIX-compliant awk program (default: awk ).

\f3TZDIR Name of the directory containing timezone data files (default: /usr/share/zoneinfo ).

\f2TZDIR\f3/iso3166.tab Table of ISO 3166 2-letter country codes and country names.

\f2TZDIR\f3/zone1970.tab Table of country codes, latitude and longitude, timezones, and descriptive comments.

\f2TZDIR\f3/\f2TZ Timezone data file for timezone \f2TZ.

The exit status is zero if a timezone was successfully obtained from the user, nonzero otherwise. newctime(3), tzfile(5), zdump(8), zic(8) Applications should not assume that tzselect 's output matches the user's political preferences.