Represents a date and time of day with an offset from UTC
'Time::Moment' is an immutable object representing a date and time of day
with an offset from UTC in the ISO 8601 calendar system.
Time is measured in nanoseconds since '0001-01-01T00Z'. In 'Time:Moment'
leap seconds are ignored. It is assumed that there are exactly
'86,400,000,000,000' nanoseconds per day. 'Time::Moment' can represent all
epoch integers from '-62,135,596,800' to '253,402,300,799'; this range
suffices to measure times to nanosecond precision for any instant that is
within '0001-01-01T00:00:00Z' to '9999-12-31T23:59:59Z'.
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