Hour: 18:00 or 18.00?
Is it correct to say 18.00 instead of 18:00 when talking about the time in 24 hours format (for instance, the time of an event)?
I've seen some people use 13.30, but as far as I knew it should be written with a : (13:30) not a .

Question

Hour: 18:00 or 18.00?
Is it correct to say 18.00 instead of 18:00 when talking about the time in 24 hours format (for instance, the time of an event)? 
I've seen some people use 13.30, but as far as I knew it should be written with a : (13:30) not a .

Answer

As I remember, 5:30 is American and 5.30 is British.

Answer

I would always use a ":" and never a "."

Answer

Always " : " 
" . " is really for money 
People will understand if they have asked you for the time though so don't panic.

Answer

You specify ¨saying it¨ not writing it  ... so saying it we say 18:00  as  eighteen hundred  
18:00 - "sixteen hundred"
18:45 - "sixteen forty-five"
18:05 - "sixteen oh-five"
Military tend to say eighteen hundred hours.

In real life, we don´t tend to speak in 24hr time so if saying it we would normally convert it to the 12 hrs clock and just say 6 pm.

Now if you wanted to know how we write it we should always write it with the ¨:  ¨  as the one dot is for currency.  However,  sometimes, you will see it with only the one dot but the context it is written in will tell you it relates to time, not money.

Answer

Always " : " 
" . " is really for money 
People will understand if they have asked you for the time though so don't panic.