Preposition (at) for time

at + time

For the time of day

at five o'clock

at eleven thirty

at midnight

at lunchtime

at sunset

For other expressions

at night

at the weekend/ at weekends

at Christmas

(But on Christmas day)

at the moment အခု​လော​လောဆယ်​

at present အခု​လော​လောဆယ်​

at the same time တစ်​ချိန်​တည်​းမှာ

at the end of (something)

Eg. At the end of January ဇန်​နဝါရီ အစမှာ

At the end of (the month/the day/the year/January/February/the game/the concert etc.)

At the beginning of (something)

Eg. At the beginning of th film ရုပ်​ရှင်​ဇာတ်​လမ်​း အစမှာ