24-hour notation

[Hunter_rus]

12-hour notation confused me when I try calculate time periods and when it is 12:00.
I guess there are more people have same problems.

Is it possible to add support for 24-hour notation in user profile?

EDIT:
1) And date (MM-DD-YYYY) is unnatural for me.

Should be DD-MM-YYYY.
Because DD is shorter MM and MM is shorter YYYY.

2) In Russia more popular dots(DD.MM.YYYY).
But this is not very important.

[Phait]

Just + 2 for each am/pm, i.e.:

13:00 - 2 = 1 pm
15:00 - 2 = 3 pm
21:00 - 2 = 19:00 = 9pm

and so on.

[Hunter_rus]

00:00 12:00 a.m.
01:00 1:00 a.m.(-11 hours?)

23:00 11:00 p.m
24:00 12:00 a.m. (changed to AM, hard to understand)

How many time passed form 10:00 a.m. to 2:00 p.m?
Better: how many time passed form 10:00 to 14:00?

12 hours is not natural for me.
I want only option in profile.

[Phait]

00:00 = 12 AM
01:00 = 1 AM and so on until 11:00 (11 AM)

12:00 = 12 PM
13:00 = 1 PM
14:00 = 2 PM and so on until 23:00 (11 PM)

24:00 or 00:00 are same (never seen 00:00)

I know it's not natural but in case you don't get the option I thought I'd clarify. I had to get used to 24:00 for my work schedule - I had a few late dates and such.

[ZuljinRaynor]

24:00 or 00:00 are same (never seen 00:00)


Funny, I've never seen 24:00. In Europe I've always seen it as 00:00 and on all my clocks.

[Hunter_rus]

Clock never show 24:00.

00:00
00:01
.
.
.
23:58
23:59
00:00 - new day (24:00 is same time but not new day)
00:01

I found good info about it:
24 http://en.wikipedia.org/wiki/24-hour_clock
12 http://en.wikipedia.org/wiki/12-hour_clock#Advantages_over_the_24-hour_clock

EDIT:
I don't want force somebody to use 24 hours.
I don't want to discuss what is better.
I only show my(I think not only my) difficults.