Currently we define timestamp values as js-uint across all events that include that given field. And js-uint is defined as:

js-uint = 0..9007199254740991

But based on the ECMA specification under Time Values and Time Range the following is mentioned:

A time value supports a slightly smaller range of -8,640,000,000,000,000 to 8,640,000,000,000,000 milliseconds. This yields a supported time value range of exactly -100,000,000 days to 100,000,000 days relative to midnight at the beginning of 1 January 1970 UTC.

Based on that we should define a separate type for timestamp values limited to just 0..8640000000000000.