Time series data must have a time entry associated with each record. Each other entry in the record is associated with that time. If present the time tag must be the first entry in a record. By default, time tags are centred within the sampling interval, and the spacing between timetags is the same as that sampling interval. For other behaviour, use Delta_PLUS and Delta_MINUS metadata in seconds to describe the sampling or integration interval corresponding to the data and the location of the time tag within that interval. The use of a second variable holding an absolute time (e.g., to hold the stop time) is possible, and other variables in a record may also themselves be time variables.
Time is represented as a text string in the strict ISO format adopted by CSDS.
This is of the form:
yyyy-mm-ddTHH:MM:ss.wwwZ
it e.g. 1996-01-30T13:30:00.000Z for January 30 1996 at 1.30 pm.