> On 26 Jan 2024, at 20:00, John Sessoms <jsessoms...@nc.rr.com> wrote:
> I have a hard time even remembering to "Spring Forward/Fall Back" ... the 
> "fall back" part isn't that big of a problem, but the week after "spring 
> forward" I'd be late for my own hanging.

It seems to me that that would be a good thing…

> What I've got is I got the *ist-D early in 2004 and set the time to "New 
> York" (aka Eastern US time zone) and shipped out to Iraq a couple of weeks 
> later.
> I didn't notice the time zone setting until I'd been in country for several 
> months. And after I did notice, I was back home for several months before I 
> noticed the camera was still on "Moscow" time (Iraq time zone)
> So I've got more than a year's worth of photos where the time is off by 12 
> hours. It's not a world shaking problem, but it BUGS ME - like ALWAYS being 
> pursued by a cloud of mosquitos. Low level irritation, but constant and 
> forever.
> Whenever I've tried to fix it in post it ends up screwing with the DATE 
> (trying to change Date Taken to the current computer date/time).
> To a lesser extent I've had the same "problems" with the K10D, K20D, K-3 & 
> the K-1.
> A camera that could automagically determine the local time zone & keep the 
> internal clock updated would suit me just fine. My cell phone can do it, why 
> can't my camera?
> I use the cell phone camera occasionally, but I like my DSLRs more. I 
> couldn't have done the eclipse on my cell phone.

I don’t know what date/time format standard the metadata is supposed to use, 
but it really ought* to be in ISO format, which (optionally) includes the 
offset from UTC. This would make your task quite straightforward using the 
method Mark suggested. The thing to be careful about, if you were writing some 
sort of macro to make the change rather than relying on a trusted routine from 
elsewhere, is when the offset takes you forward or back to a different date. 
For example, time showing as 11am on 1 March, subtract 12 hours - was it a leap 
year? Make sure you have a backup!

*a well-designed system would distinguish between the format of the stored date 
time (I would usually use ISO), and the format of the displayed date time, so 
years later when looking at your photos in the comfort of Badiddlyboing, 
Odawidaho you ask yourself, what the hell time was it in Ulan Bator when I made 
this masterpiece? It can tell you without having to change any of your data.

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