時だ

It is the time to; it is the moment when

→ 時
phrase Common #4,341
It is the time to; it is the moment when Used to identify a particular time as when something happens or should happen.
JA: 今が死ぬ時だ。
EN: Now is the time to die.

彼が母親と愛人を殺した時だ

It was when he killed his mother and his mistress.

— サイコ (1960)

その時も時だあいつにとっちゃ命取りのあの事件が起こった

Then came the incident that would prove fatal for him.

— High and Low (1963)

今が死ぬ時だ

Now is the time to die.

— ザ・マン・フロム・アース (2007)

銃から飛び出して英国人の心臓を貫いた時だ

It was when it shot out of the gun and pierced an Englishman’s heart.

— RRR (2022)

夜が明ける時が帰る時だ

When dawn breaks, it's time to go home.

— 恋する惑星 (1994)

今が我々にとって一番大切な時だ。

Now is the most important time for us.