The values for the TZ variable are defined below.
| 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 |