大たい西せい洋よう標ひょう準じゅん時じ

Meanings

1

noun

Atlantic Standard Time; AST

Time zone used in parts of eastern Canada, the Caribbean, and some Atlantic islands; UTC−4.

signpost, seal, mark

準semi-, correspond to, proportionate to

時time, hour

東とう部ぶ標ひょう準じゅん時じ
Eastern Standard Time (EST), UTC−5, one hour behind AST.
大たい西せい洋よう夏なつ時じ間かん
Atlantic Daylight Time (ADT), UTC−3, the summer counterpart of AST.

Compound of 大西洋 (Atlantic Ocean) + 標準時 (standard time).