TZ environment parameter variables

The values for the TZ variable are defined below.

Table 1. TZ environment parameter variables
Variable Description Default value
SSS Standard time-zone identifier. This must be three characters, must begin with a letter, and can contain spaces. EST
n Difference (in hours) between the standard time zone and coordinated universal time (UTC), formerly called Greenwich mean time (GMT). A positive number denotes time zones west of the Greenwich meridian. A negative number denotes time zones east of the Greenwich meridian. 5
DDD Daylight saving time (DST) zone identifier. This must be three characters, must begin with a letter, and can contain spaces. EDT
sm Starting month (1 to 12) of DST 4
sw Starting week (-4 to 4) of DST 1
sd Starting day of DST: 0 to 6 if sw is not zero; 1 to 31 if sw is zero 0
st Starting time (in seconds) of DST 3600
em Ending month (1 to 12) of DST 10
ew Ending week (-4 to 4) of DST -1
ed Ending day of DST: 0 to 6 if ew is not zero; 1 to 31 if ew is zero 0
et Ending time (in seconds) of DST 7200
shift Amount of time change (in seconds) 3600