Support for Timestamp and Duration values

[smackem]

timestamp("2022-04-01 23:59:59.123Z", "yyyy-MM-dd HH:mm:ss.fff") parses a timestamp
deconstruct(ts) returns a record with the fields year, month, day, hour, minute, second, millisecond
duration("1.23:59:59.123") parses a duration
deconstruct(duration_value) returns a record with the fields days, hours, minutes, seconds, milliseconds
real(duration_value) returns the total seconds of the passed duration_value

[smackem]

timestamp() gets the current time
unixtime(some_timestamp) converts the timestamp to the number of milliseconds since unix epoch (1970-01-01 UTC)