| Parameter | Mand | Type | Default | Constraints |
| t0 | yes | string | | |
Starting time, e.g. 1998-11-25T17:21:00.
|
| arg | no | string | dt | dt|t1 |
determines the second argument. If 'dt', the time 'dt' will be added to t0 and the result is printed. If 't1', the difference between t0 and t1 is printed.
|
| dt | no | real | | |
time interval, possibly negative, in seconds.
|
| t1 | no | string | | |
end time, e.g. 2000-01-01T00:00:00
|
| Parameter | Mand | Type | Default | Constraints |
