18:30 It's a half past six p. m. or eighteen thirty .

У 18.30 – at half past six p. m.

17:30 – it's half past five. 19:00 – it's seven o'clock. 19:10 – it's ten past seven. 19:45 – it's a quarter to eight.

У 16:30 я знову забираюся в будинку. At 4:30 p.m.