YOU SAID:

i only called you when it was half past

INTO JAPANESE

半分過ぎた時に電話した

BACK INTO ENGLISH

I called when I was half past

INTO JAPANESE

私は半分過ぎたときに電話しました

BACK INTO ENGLISH

I called when half past

INTO JAPANESE

半分過ぎたら電話しました

BACK INTO ENGLISH

I called after half the time

INTO JAPANESE

私は半分の時間の後に電話しました

BACK INTO ENGLISH

I called after half the time