The Use Case:

Allow calendar expressions in trim and slice of time axes in WCS, WCPS.

The service:

Flexible and powerful feature for addressing temporal coordinates in WCS / WCPS subsetting and other operations. A common use case is aggregating data over a time series per temporal unit, e.g. per day, month, year, etc. Try the examples provided at the bottom and press "Execute".

Not sure about calendar? Read the doc on rasdaman doc.