Prepositions of time in English AT

1. USED WITH PARTS OF THE DAY

1.1. At dawn (en la madrugada)

1.1.1. The first appearance of light in the sky before sunrise

1.2. At sunrise (al amanecer)

1.2.1. The time when the sun rise

1.3. At sunset (al atardecer, cuando el sol se oculta)

1.3.1. The time when the sun goes down. Approximately at 6:00 P.M.

1.4. At dusk (al atardecer)

1.4.1. The last light in the sky, just after sunset

1.5. At night (en la noche)

1.5.1. From sunset to sunrise

1.6. At midnight (a la media noche)

1.6.1. At 00:00

1.7. At midday (al mediodía)

1.7.1. At noon (al mediodía)

1.7.1.1. At 12:00 P.M.

2. USED FOR SPECIFIC TIME OR HOUR AT THE DAY

2.1. At 8:00 A.M.

2.2. At six-fifteen

2.3. At midnight

2.3.1. Midnight is a specific hour; It's 12 o'clock at night.

3. USED FOR A HOLIDAY PERIOD OR FESTIVAL

3.1. At Christmas

3.1.1. They sing carols at Christmas

3.2. At Thanksgiving

3.2.1. Come and visist us at Thanksgiving!

3.3. At Easter

3.3.1. Do you go on vacation at Easter?