in
+ epoka/wiek/rok/miesiąc → ancient times, 2005, March, the 20th century.
+ pora roku → autumn, summer.
+ pora dnia → the afternoon, midnight, the evening, the morning.
on
+ dzień/data → Easter, Christmas Eve, Christmas.
+ konkretny dzień → 28th April, Easter Monday.
+ pora dnia w danym dniu → Friday night, Tuesday morning.
at
+ godzina → eight thirty, 6.20.
+ kilka dni → the weekend.
+ pora posiłków → breakfast, lunchtime.
