Cylchfa Amser: Rhan o'r Ddaear sydd a parth amser safonol
Rhanbarth o'r Ddaear sydd wedi mabwysiadu'r un amser safonol, sydd fel arfer yn cael ei alw'n amser lleol, yw cylchfa amser (lluosog: cylchfaoedd amser, cylchfâu amser).
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| Math | non-political administrative territorial entity, safon amser, rhanbarth  |
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 Ffeiliau perthnasol ar Gomin Wicimedia | |
Gweler hefyd
- Amser Safonol Greenwich
- UTC
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