UTC

Coordinated Universal Time. The civil standard of marking universal time; formerly known as Greenwich Mean Time (GMT), then Zulu Time (ZT). Universal time is denoted in 24 hour format, usually omitting the colon: 1432 (14:32) = 2:32 p.m. Coordinated Universal Time is marked either as UTC or Z (for Zulu)

The Olympics Opening Ceremonies will air on television starting at 1530 UTC.

or

The Olympics Opening Ceremonies will air on television starting at 1530Z

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