This is time to offer prayers.

This is time for prayers to be offered

This was time for prayers to be offered

This is time for prayers to be offer

This is time for prayers to offered

All of the above

Active Voice: This is time to offer prayers.

Correct Passive Voice: This is time for prayers to be offered.

This is time to offer prayers means عبادت کرنے کا وقت آگیا ہے

Offer is a verb here.

Third form of verb is always used in passive voice sentence.