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Old 19 June 2009, 15:31   #1
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time zones

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Originally Posted by neilda View Post
Never heard of UTC before,
UTC = GMT same thing, different name.

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I thought the PC version would pick up the time change from the internal clock.
yeah but mariners are funny folk who like to work in GMT rather than local time, except when it suits them!
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Old 19 June 2009, 18:50   #2
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I was 24 hours out ! Whats 'Zulu' time then - whats DST , GMT & BST compared to UTC ?

Can I have whole new thread for this ?
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Old 19 June 2009, 19:05   #3
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Can I have whole new thread for this ?
It seems that you can (I get them all the time!)

We use ADT in the club - Adjusted Divers Time.....

Which is about 25% later than would be generally acceptable under the given circumstances
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Old 19 June 2009, 19:13   #4
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So I reckon ;

GMT - Greenwich mean time
BST - British summer time ( GMT + 1)
ZULU - same as GMT ?
UTC - SAME AS GMT/ZULU ?

Any others out there for UK time ?

Europe is CET ( BST + 1 ) ?
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Old 19 June 2009, 19:22   #5
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Originally Posted by Blackroady View Post
I was 24 hours out ! Whats 'Zulu' time then - whats DST , GMT & BST compared to UTC ?
UTC = Coordinated Universal Time
GMT = Greenwich Mean Time
Z = Zulu time

all are the same thing in terms of "time zone". I think there are some very subtle distinctions relating to how we "measure" time, but to you and me - its the time in London during "winter".

DST = Daylight Saving Time
BST = British Summer Time

DST is the concept that during some months of the year we manually shift the time zone to better suit our "working lifes" and supposedly to reduce the number of road accidents.

BST is local time in London during the "summer", it is used in the UK as the convention for DST. Different time zones use different DST's - most add an hour, but the start and end dates are different in different countries.

BST = UTC+1 e.g. 0900 BST = 0800 UTC

the military abbreviated time zones to single letters - and defined UTC/GMT as Z.

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Can I have whole new thread for this ?
done
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Old 19 June 2009, 19:26   #6
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Quote:
Originally Posted by Blackroady View Post
Europe is CET ( BST + 1 ) ?
CET = GMT+1

But at the same time as we switch to BST the rest of the EU switches to CEST which is GMT+2
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Old 19 June 2009, 19:54   #7
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For people trouble sleeping!

http://en.wikipedia.org/wiki/Coordinated_Universal_Time

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Old 19 June 2009, 19:58   #8
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I'm not entirely sure what you want from this thread.

But bear with me on this one....

Rightly or wrongly we (ie British Isles) run a system whereby we use UCT (Temps Universel Coordonné) which is GMT (Greenwich Mean Time) (apart from fractions of a second not exceeding 0.9 of one) but we change (rightly or wrongly) to BST (British Summer Time) for the summer months. The dates on which the times change vary slightly from year to year. This year our (British) clocks went forward (one SPRINGS forward) in spring on eve of 28 March. GMT (UCT) (if you are following this) starts again on 25 October (when one FALLS back: Fall being our American cousins' word for Autumn).

Most computers recognise this but when reading tide times you need to know which time is being shown: BST (as we currently are) needs an hour added to UCT (in which most tide times are given).

Oh. And by the way you may need to know that: the Earth's rotational speed is very slowly decreasing due to tidal deceleration, causing the mean solar day to increase in length.

This may or may not be a good thing but it messes all the above about.

And if anyone is still reading this: 'Zulu time' = UTC = CET = Central European Time.

I think I'm heading to the bilges: and I've got my bets on which moderator is going to put me there....
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Old 19 June 2009, 20:24   #9
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Won't be me...This is all very relevant IMO.
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Old 19 June 2009, 20:39   #10
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I wasn't anticipating you, and Louise has been very quiet recently.

Scurvey Crew and I are going to watch the rag and stick people go round that lump of chalk tomorrow. With a late night like this, I don't suppose you'll be joining us?

David
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