| Base Type | none |
string field representing time-only represented in UTC (Universal Time Coordinated, also known as "GMT") in either HH:MM:SS (whole seconds) or HH:MM:SS.sss* (milliseconds) format, colons, and period required. This special-purpose field is paired with UTCDateOnly to form a proper UTCTimestamp for bandwidth-sensitive messages.
Valid values:
HH = 00-23, MM = 00-59, SS = 00-60 (60 only if UTC leap second), sss* fractions of seconds. The fractions of seconds may be empty when no fractions of seconds are conveyed (in such a case the period is not conveyed), it may include 3 digits to convey milliseconds, 6 digits to convey microseconds, 9 digits to convey nanoseconds, 12 digits to convey picoseconds; Other number of digits may be used with bilateral agreement.
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