12:05am-> twelve 0 five am, or your first way is very common in British English. five past twelve is another way to say the same thing. it is probably best to find out what is officially being taught in schools today (not on internet) and use that, but in the UK you can use a mixture of whatever system you like.

You are correct (though you would pronounce the 0 too, 'twelve oh five AM'). Any time between midnight and midday is AM, any time between midday and midnight is PM. You could say 'five past midnight', or you could use the 24 hour clock and say 'oh oh oh five', but few people outside the military and emergency services use the 24 hour clock. Note that midday and midnight themselves are neither AM nor PM. Many native speakers are unaware of this, and might describe a time as 12PM, but it is usually clear from the context which 12 they mean by it. John's 'five past twelve' is preferable, as at least the ambiguity is clear.

Can you please tell me how you would say it? Thanks.

no you cant. people would understand what you meant but its inproper english

no you cant. people would understand what you meant but its inproper english