.....is wednesday 12am the beginning of wednesday (ie last night) or the end of wednesday (11.59 tonight) ???? 
12am is still the night before i think.
Son was born right on 12 and the midwife said it was still the day i went into labour. Which was nice as it was great grannies 80th birthday aswell.
MerlinsBeard
Wed 17-Dec-08 13:51:39
wed 12 am would be the very first thing on wednesday after Tuesday night
Noon is 12pm, 12am is the very beginning of wednesday
eg 11:59pm Tuesday (tick tock), 12am Wednesday
my son must have had his birthday on the wrong day for the last five years then!! 
PoinsettiasScareMe
Thu 18-Dec-08 16:30:46
Your midwife seriously told you that his birthday was "Tuesday 24th" (example) when he was born on the tuesday/wednesday 12am?!?!!
115959 is (eg) Tuesday & 000001 is Wednesday but what is 000000?
"Midnight on Tuesday" is the end of Tuesday so still Tuesday - isn't it? Colloquially speaking?
Good question, OP 
I think Ponders is right and it comes down to the seconds.
12:00:00 is Tuesday Night )for e.g)
12:00:01 is Wednesday morning

But that is like saying 12.00.00 is still morning and not noon until it is 1 sec past, and what about teenieths of a second...?
Actually, thinking about it more (am bored! lol) I think I was wrong, I think 00:00:00 is Wednesday morning and not Tuesday night, it's starting over from zero isn't it..new day and all that.
Yep am convinced now 23:59:59 is the last second of the day
(need to find more important things to think about)
Exactly how accurate are the clocks in maternity units? 
120000 is noon & 000000 (or 240000) is midnight - but 010000 comes at the end of the 1st hour, so 240000/000000 comes at the end of the 24th hour, therefore the second of midnight falls at the end of the previous day; a second past midnight is the first second of the next day.
yes surely it should be 000000 but 240000 in which case it would still be the night before.
Have just reread OP & we're not helping 
grumpalumpa, IMO 12am Wednesday means Tuesday midnight. (I think....)
Tyke1
Fri 02-Jan-09 13:16:32
think about new years eve/day .as soon as clock strikes midnight thats the beginning of a new year
Doesn't mean much though we celebrated the new millennium a year out too
AlexiaMumsnet
(MNHQ)
Fri 02-Jan-09 15:27:00
I think it's half a second in (or something like that...) then it's the following day e.g. 11.59pm is weds night then 12.00am is wednesday until half a second in then it's Thursday
Could be completely wrong of course!!
for comps, your still in the draw if your entering 12.00am or before (11.59pm)
Basically you have until midnight on Wednesday
have i confused the hell out of everyone yet? I've confused myself 
AndATigerschickInAPearTree
Fri 02-Jan-09 15:32:52
I'd say that exactly midnight is the beginning of the next day.
235959 is the last second of, say, Tuesday and 000000 is the first second of, say, Wednesday. A minute is 60 seconds so, if you start with 0 you get to 60 on 59 ... IYSWIM
You are counting the end of the second/minute/hour etc.
It's the same as when you say your age. You are 1 at the end of your first year ...
I don't think I'm making much sense, am I???
I did this earlier, Tigerschick (post at 1302) - 0100 comes at the end of the first hour, so 0000 or 2400 comes at the end of the 24th hour, before it goes on into the first minute of the next day:
235958 - 235959 - 000000 (end of day 1)
000001 (start of day 2)
If a competition closes at "12am Wednesday" I would clarify with the organisers which end of Wednesday they mean 
haha - I am glad to see that everybody else is as confused as i am!!!!
00000000 is everything resetting so is clearly the start, and not the end of anythin
AndATigerschickInAPearTree
Fri 02-Jan-09 16:57:09
I agree with Flamespar - but in the case of a competition, I'd check with the organisers ... but then again, I'm so competitive, I'd have entered loooong before then anyway 
AlexiaMumsnet
(MNHQ)
Sat 03-Jan-09 01:25:16
I also agree with Flame, to save further confusion, i've amended the comps page and changed it to midnight on Wednesday! 
Thanks alexia - at least now I know!!