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PostPosted: Sun Jun 24, 2012 7:01 am 
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Does anyone know when the date is supposed to change on a GMT? My GMT 44 seems to change when the 24 hour hand reaches midnight (24h), but the local time (also set to the home time) is approximately 10 minutes to midnight (ie. 11:50pm EST). Is that normal? I've never had a GMT and so all my watches have always changed date closer to when the minute hand is at midnight.

Also when I wind the hour hand backwards to go back a day, the date switches around 9ish. The hour hand seems to be "off" as I keep going backwards until around 4ish. Specifically, the hand clicks in-between hours until it reaches the number 4 on the dial. Going backwards from 4 to 3 to 2 seems normal againl. Is that the way it is supposed to work?


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PostPosted: Sun Jun 24, 2012 8:23 am 
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Winding time backwards to change the date is never a good idea. It's less of an issue with the in house movement, but on most watches you can cause serious damage doing that.

If the date is changing within 10 minutes of midnight then there is no issue - it's not always going to be exactly at midnight.


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PostPosted: Sun Jun 24, 2012 9:31 am 
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Thanks. I would never go backwards on a non GMT. So I shouldn't on my GMT too?


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PostPosted: Sun Jun 24, 2012 9:33 am 
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tulgs212 wrote:
Thanks. I would never go backwards on a non GMT. So I shouldn't on my GMT too?



It's got nothing to do with whether it's a GMT, unless the watch has an instant date change you can severely damage the date change mechanism. Fortunately, yours has an instant date change.


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PostPosted: Sun Jun 24, 2012 9:41 am 
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Actually my GMT does not have an instant date change. I don't believe any GMT has an instant date change....


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PostPosted: Sun Jun 24, 2012 9:48 am 
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Correction--it doesn't have a quick set date change, but it does have an instant date change.


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PostPosted: Sun Jun 24, 2012 1:40 pm 
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tulgs212 wrote:
Correction--it doesn't have a quick set date change, but it does have an instant date change.



I know. :lol:


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PostPosted: Sun Jun 24, 2012 3:56 pm 
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I was under the impression you CAN go backwards on a GMT. The reason is convenience if you travel to an earlier time zone. When I say backwards, it's in the crown position that only changes the local zone... The position where the hour jumps one hour at a time and the minutes and seconds still keep time.

My 8500 PO has this feature also even though it's not a GMT. In order to change the date you have to move the our hand in either direction by 24 hours. The manual says if you go backwards, you need to go passed 7 or 8 pm for the date to fully change over to the previous day.

So to answer your question, the date does change around 9pm, at least when going backwards.


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PostPosted: Sun Jun 24, 2012 3:59 pm 
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RXPete wrote:
I was under the impression you CAN go backwards on a GMT. The reason is convenience if you travel to an earlier time zone. When I say backwards, it's in the crown position that only changes the local zone... The position where the hour jumps one hour at a time and the minutes and seconds still keep time.


That's correct. Maybe I misunderstood the OP I thought that it was the 'regular' time change.


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PostPosted: Sun Jun 24, 2012 4:26 pm 
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RXPete wrote:
I was under the impression you CAN go backwards on a GMT. The reason is convenience if you travel to an earlier time zone. When I say backwards, it's in the crown position that only changes the local zone... The position where the hour jumps one hour at a time and the minutes and seconds still keep time.

My 8500 PO has this feature also even though it's not a GMT. In order to change the date you have to move the our hand in either direction by 24 hours. The manual says if you go backwards, you need to go passed 7 or 8 pm for the date to fully change over to the previous day.

So to answer your question, the date does change around 9pm, at least when going backwards.


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Thanks Peter. I just wasn't sure that my watch was working correctly since:
1) The date was changing according to the GMT hand hitting midnight and not the customary hour hand of local time hitting 12am.
2) After I turn the crown backwards to make the hour hand reverse reverse (roll back) the date at around 9, the hour hand doesn't seem to settle in correctly until I continue winding past 4 on the dial. When winding the crown backwards between 9 and 4, the hour hand clicks in between the numbers until I reach 4 then the watch hour hand corrects itself and then hit exactly 4 then exactly 3, etc. Does that make sense? I wasn't sure that I should roll the date back if that was happening.


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PostPosted: Sun Jun 24, 2012 5:50 pm 
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1. which hour hand - the regular one or the 24 hour one?

2. For my edification, because I truly do not know - on the B04 movements, does the 24 hour/GMT hand set like it does on an ETA 2893 or do you set the 12 hour hand, which jumps by the hour, like on a Rolex or Omega?

3. Either way, the hour hand being the only setting hand - like Rolex and Omega, or the GMT hand moving separately with the crown, it should jump hour by hour and there shouldn't be a several hour zone where it moves by the half hour.

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PostPosted: Mon Jun 25, 2012 2:12 pm 
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sharkman wrote:
1. which hour hand - the regular one or the 24 hour one?

2. For my edification, because I truly do not know - on the B04 movements, does the 24 hour/GMT hand set like it does on an ETA 2893 or do you set the 12 hour hand, which jumps by the hour, like on a Rolex or Omega?

3. Either way, the hour hand being the only setting hand - like Rolex and Omega, or the GMT hand moving separately with the crown, it should jump hour by hour and there shouldn't be a several hour zone where it moves by the half hour.


Hi Sharkman:
I'm not sure how the ETA 2893 works, but the B04 is just like the Rolex GMT. I set the normal 12h hand which jumps on the hour (and controls the date function). The 24 hour/GMT hand moves along with the minute hand when rotating the crown forwards or backwards. I set the watch to keep 24hour time in sync with my local New York EST. If I travel, I plan to just set the 12 hour hand to the local time. Interestingly, the red-tip GMT hand gets to the designated "hour" faster than the 12 hour hand because the 12 hour hand relies on the minute hand to strike "12". It can say 11:46pm on my 12hour clock but my GMT hand has already reached the 24 hour designation on the watch face. The GMT hand is running 16 minutes faster. I wasn't sure if that was how it was supposed to work if if my GMT hand was "out of sync" with the 12hour hand/ minute hand. As soon as the minute hand hits 59min and the hour hand is in the "12" position, my Cockpit date changes. But the date on my GMT 44 snaps the date forward when the 12 hour time says "11:46pm" because the GMT hand already reached "24" on the watch face. Should the GMT hand be more in sync with the 12 hour clock hands? or is this normal for a GMT?

Also since this is a GMT, I just wanted to confirm that it is OK to wind the date backwards (by turning the crown/12 hour hand backwards counter clockwise). I would never do this on my Cockpit. As I wind the crown counter clockwise, the hour hand moves from 12 to 11 to 10 to 9--at 9 the date reverses one day. If it is OK, then is it normal for a the 12 hour hand to not click exactly at the hour designations between 9 and 4 on my watch? It seems to click in-between the hour markers going backwards from 9 to 4. But by continuing to turn my crown/hour hand (non gmt hand) to 4 the hour hand corrects itself, and as I keep turning the crown counter clockwise the hour hand clicks exactly on 3, exactly on 2, exactly on 1, etc. Wasn't sure if that was normal or if I needed to have Breitling take a look at it....make sense?


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PostPosted: Mon Jun 25, 2012 4:59 pm 
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The date change is fine - it's likely just slack in the mechanism (which is necessary to prevent binding) and you can probably play around with the time setting to change that 16 minutes - but it won't stick.

You can safely move the time backwards on this watch regardless of which hand because it's instant date change (as is the Cockkpit), it's not recommended for the minute / hour time change however, but is fine for the hour only / time zone setting.


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PostPosted: Sun Jul 01, 2012 2:07 pm 
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Thanks Roff. Just to confirm--so it's not good to roll the date backwards via the hour hand. Correct? I would never attempt on my Cockpit but wasn't sure with my GMT. Thanks again for all your help.


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PostPosted: Sun Jul 01, 2012 2:59 pm 
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tulgs212 wrote:
Thanks Roff. Just to confirm--so it's not good to roll the date backwards via the hour hand. Correct? I would never attempt on my Cockpit but wasn't sure with my GMT. Thanks again for all your help.



As I said, not for a 'normal' change - fine for GMT.


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