AssertMilliseconds ensures that a given timestamp is in milliseconds.

AssertSeconds ensures that a given timestamp is in seconds.

GetPeriodsStartAndEndUTC returns the start and end timestamps (in milliseconds) given two months for location UTC (timezone).

MillisecondsNow returns milliseconds for time now.

MillisecondsTime returns a Time struct for a given millisecond timestamp.

MillisecondsUnix returns milliseconds for given time.