Daylight saving on Camera and Photoshop

mkpatil · July 24, 2007

This is what I noticed and re-did to confirm that it is happenning. My camera - Canon EOS-1D Mark II N is one hour behind (I did/do not adjust time during daylight saving time, etc) Therefore when I take a picture at say 7:30pm it shows the time of picture's 'Date Taken' as 6:30pm as expected. But when I open that picture in Photoshop and 'Save as' to another file, the 'Date Taken' on the new file is getting adjusted to 7:30pm as if the photoshop application knew the camera was off, thereby adding one hour. I am surprised how PS is getting the real 'Date Taken' or how it knows that the camera is off by one hour.

Thanks,
Milind

David_S85 · July 25, 2007

Big Brother has your back.

If true, I find this either way kewl, or mildly disturbing.

Did you try setting the "correct" time on your camera? What does CS3 interpret it as? Does Bridge see it that way too?

pyrtek · July 25, 2007

Nothing sinister going on here. I extracted all the date fields from some of my
files. Here are the fields for photographs taken in March:

[html]IMG_3302.CR2:
File Modification Date/Time : 2007:03:13 13:51:58
Modify Date : 2007:03:13 12:51:57
Date/Time Original : 2007:03:13 12:51:57
Create Date : 2007:03:13 12:51:57

IMG_3303.CR2:
File Modification Date/Time : 2007:03:13 13:52:26
Modify Date : 2007:03:13 12:52:25
Date/Time Original : 2007:03:13 12:52:25
Create Date : 2007:03:13 12:52:25

IMG_3304.CR2:
File Modification Date/Time : 2007:03:13 13:52:54
Modify Date : 2007:03:13 12:52:51
Date/Time Original : 2007:03:13 12:52:51
Create Date : 2007:03:13 12:52:51

IMG_3305.CR2:
File Modification Date/Time : 2007:03:13 13:54:06
Modify Date : 2007:03:13 12:54:05
Date/Time Original : 2007:03:13 12:54:05
Create Date : 2007:03:13 12:54:05
[/html]

As you can see, there's a one hour difference between the File Mod D/T and
the other date fields. And here are the fields from files taken in April:

[html]

IMG_3566.CR2:
File Modification Date/Time : 2007:04:15 17:02:28
Modify Date : 2007:04:15 17:02:27
Date/Time Original : 2007:04:15 17:02:27
Create Date : 2007:04:15 17:02:27

IMG_3567.CR2:
File Modification Date/Time : 2007:04:15 17:03:48
Modify Date : 2007:04:15 17:03:47
Date/Time Original : 2007:04:15 17:03:47
Create Date : 2007:04:15 17:03:47

IMG_3568.CR2:
File Modification Date/Time : 2007:04:15 17:14:30
Modify Date : 2007:04:15 17:14:29
Date/Time Original : 2007:04:15 17:14:29
Create Date : 2007:04:15 17:14:29

IMG_3569.CR2:
File Modification Date/Time : 2007:04:15 17:15:26
Modify Date : 2007:04:15 17:15:25
Date/Time Original : 2007:04:15 17:15:25
Create Date : 2007:04:15 17:15:25
[/html]
No difference.

mkpatil · July 25, 2007

David: I did not adjust or test with corrected time on the camera. Also I do not have access to CS3 or Bridge (only CS)

Bernard: Can you test the following: Can you do a "save as" one or more pictures from each category (months) and see if you are able to see anything different after saving.

Thanks,
Milind

pyrtek · July 26, 2007

mkpatil wrote:

Bernard: Can you test the following: Can you do a "save as" one or more pictures from each category (months) and see if you are able to see anything different after saving.

Sure. I'll do that tonight when I'm at home.

ivar · July 26, 2007

just put everything on Zulu-time and your problems are solved

jdryan3 · July 26, 2007

ivar wrote:

just put everything on Zulu-time and your problems are solved

Funny you would say that. I keep mine on Eastern Standard time year round. Especially out west (AZ, NM, UT, NV) where it is easy to move among time zones that may or may not be on DST or in Mountain/Pacific, I just know for any given date to translate to my baseline time.

Daylight saving on Camera and Photoshop

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