グリニッジ標ひょう準じゅん時じ

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Meanings

1

noun

Standard term for the time zone; used in technical, scientific, and everyday contexts.

signpost, seal, mark

準semi-, correspond to, proportionate to

時time, hour

協きょう定てい世せ界かい時じ
UTC (Coordinated Universal Time) is the modern time standard, while GMT is a time zone. In casual use they are often interchangeable.

From English 'Greenwich Mean Time', with 標準時 meaning 'standard time'.