at 3 o´clock a.m./p.m.

[the_one_and_only]

Hi,

Could you, please, tell me if it´s proper to say that something will take place at, for instance, 3 o´clock a.m. or we can´t use the a.m. in this case and we should say instead: at 3 o´clock in the morning?
Many thanks!

 

[Dimcl]

"3:00 A.M." is perfectly fine. So is "3 o'clock in the morning".

 

[roxcyn]

Both of those you said, friend, are correct. If you want you could also say 03:00 (on the 24 hour system) which will be "oh three hundred".

Peace
Pablo

 

[panjandrum]

... three a.m. ...
... three in the morning ...
... three o'clock in the morning ...
... three o'clock a.m. ...

The "o'clock a.m." version seems unusual to me, but I wouldn't say it was incorrect or not proper.

 

[the_one_and_only]

Yes, Panjandrum, I also think the version with o´clock a.m. sounds unusual. I lived for 8 years in London and never heard it.
Many thanks to you all!