Say what time it is

じ marks the hour and ふん marks the minutes when telling the time; はん means "half past".

JLPTN5

[hour]じ[minutes]ふん + です

じ attaches to the hour, ふん to the minutes. はん after the hour means thirty minutes past, so よじはん is 4:30. なんじ means "what time is it".

Tips and Common Traps

Maru· Common trap

A quarter to five is よじよんじゅうごふん: Japanese counts forward from the hour that has passed.