The Date object enables basic storage and retrieval of dates and times, and can be used to set timestamps, do calculations of time differences and to validate dates in the respondent's answers.
The Date object types of JScript .NET and JavaScript provide a common set of methods for working with dates and times; these take the form of either the Local Time or Universal Coordinated Time (UTC). Since we are working with scripts that run on the Forsta Plus servers (server-side), not on the respondent's PC (client-side), Local Time means the time on the Forsta Plus servers you are working on. For most multi-tenant servers, these will be Universal Coordinated Time (UTC) (sometimes also called "Zulu Time"), which was formerly called Greenwich Mean Time (GMT) and is the mean solar time at the prime meridian (0° longitude).
Date values are stored internally as the number of milliseconds since January 1, 1970 UTC. For dates before this date, this will be a negative number. The range of dates that can be represented in an instance of the Date object is approximately 285,616 years on either side of January 1, 1970. This should be sufficient for most of us.