Cal obs request start and end time must include HH:MM:SS

[nvolgenau]

The start and end times of a Cal obs request (photometric standard observation) are currently limited to dates, i.e. MM/DD/YYYY. The times default to 0 UT for both start and end. However, submit_calibration in calibration_utils is typically used to schedule a cal observation in a narrow window. For example, an auto_focus must be run before a science observation begins, or a photometric standard must be observed in the last hour of a night.

The cal obs request submission form must allow the window to be specified to a precision of seconds, not days.