When generating a color printout of the roster in Crew Calendar it is possible to insert the date and hour, in order to specify the time in the past, for which the state of the roster will be printed. That date will appear as an Effective Date timestamp on the generated excel document.
Once you hit the print icon in the pop-up window you may insert the date and hour in 'hh:mm' format. It is not obligatory but once inserted, and COLOR (NEW) button is hit, the generated document will show the state of the roster for the specified time in the past, and that time will be shown as 'Effective Date'.
The time inserted will appear as UTC time.
Please note that the Color version may be produced only for the time range of 1 month per single export.