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Image-ExifTool
Posted on 2008-07-18 11:15:00-07 by justin in response to 8347
Re: Problem Setting FileModifyDate

Hi Phil, I got round to testing with the "auto adjust for daylight savings" turned off with the following results:

C:\nefs>exiftool -alldates -filemodifydate * ======== 2007-03-25_D50_DSC_4513.NEF Date/Time Original : 2007:03:25 18:35:16 Create Date : 2007:03:25 18:35:16 Modify Date : 2007:03:25 18:35:16 File Modification Date/Time : 2008:07:14 16:02:49 ======== 2007-03-25_D50_DSC_4514.NEF Date/Time Original : 2007:03:25 18:35:37 Create Date : 2007:03:25 18:35:37 Modify Date : 2007:03:25 18:35:37 File Modification Date/Time : 2008:07:14 16:02:49 ======== 2007-03-25_D50_DSC_4515.NEF Date/Time Original : 2007:03:25 18:35:59 Create Date : 2007:03:25 18:35:59 Modify Date : 2007:03:25 18:35:59 File Modification Date/Time : 2008:07:14 16:02:49 ======== DSC_1056.NEF Date/Time Original : 2008:06:18 15:10:17 Create Date : 2008:06:18 15:10:17 Modify Date : 2008:06:18 15:10:17 File Modification Date/Time : 2008:06:18 16:10:20 4 image files read C:\nefs>exiftool "-filemodifydate<createdate" * 4 image files updated C:\nefs>exiftool -alldates -filemodifydate * ======== 2007-03-25_D50_DSC_4513.NEF Date/Time Original : 2007:03:25 18:35:16 Create Date : 2007:03:25 18:35:16 Modify Date : 2007:03:25 18:35:16 File Modification Date/Time : 2007:03:25 19:35:16 ======== 2007-03-25_D50_DSC_4514.NEF Date/Time Original : 2007:03:25 18:35:37 Create Date : 2007:03:25 18:35:37 Modify Date : 2007:03:25 18:35:37 File Modification Date/Time : 2007:03:25 19:35:37 ======== 2007-03-25_D50_DSC_4515.NEF Date/Time Original : 2007:03:25 18:35:59 Create Date : 2007:03:25 18:35:59 Modify Date : 2007:03:25 18:35:59 File Modification Date/Time : 2007:03:25 19:35:59 ======== DSC_1056.NEF Date/Time Original : 2008:06:18 15:10:17 Create Date : 2008:06:18 15:10:17 Modify Date : 2008:06:18 15:10:17 File Modification Date/Time : 2008:06:18 15:10:17 4 image files read C:\nefs>exiftool -filemodifydate-=1 * 1 image files updated 3 image files unchanged C:\nefs>exiftool -alldates -filemodifydate * ======== 2007-03-25_D50_DSC_4513.NEF Date/Time Original : 2007:03:25 18:35:16 Create Date : 2007:03:25 18:35:16 Modify Date : 2007:03:25 18:35:16 File Modification Date/Time : 2007:03:25 19:35:16 ======== 2007-03-25_D50_DSC_4514.NEF Date/Time Original : 2007:03:25 18:35:37 Create Date : 2007:03:25 18:35:37 Modify Date : 2007:03:25 18:35:37 File Modification Date/Time : 2007:03:25 19:35:37 ======== 2007-03-25_D50_DSC_4515.NEF Date/Time Original : 2007:03:25 18:35:59 Create Date : 2007:03:25 18:35:59 Modify Date : 2007:03:25 18:35:59 File Modification Date/Time : 2007:03:25 19:35:59 ======== DSC_1056.NEF Date/Time Original : 2008:06:18 15:10:17 Create Date : 2008:06:18 15:10:17 Modify Date : 2008:06:18 15:10:17 File Modification Date/Time : 2008:06:18 14:10:17 4 image files read ***** AT THIS POINT I DISABLED "AUTOMATICALLY ADJUST FOR DAYLIGHT SAVINGS" ***** C:\nefs>exiftool -filemodifydate-=1 * 4 image files updated C:\nefs>exiftool -alldates -filemodifydate * ======== 2007-03-25_D50_DSC_4513.NEF Date/Time Original : 2007:03:25 18:35:16 Create Date : 2007:03:25 18:35:16 Modify Date : 2007:03:25 18:35:16 File Modification Date/Time : 2007:03:25 17:35:16 ======== 2007-03-25_D50_DSC_4514.NEF Date/Time Original : 2007:03:25 18:35:37 Create Date : 2007:03:25 18:35:37 Modify Date : 2007:03:25 18:35:37 File Modification Date/Time : 2007:03:25 17:35:37 ======== 2007-03-25_D50_DSC_4515.NEF Date/Time Original : 2007:03:25 18:35:59 Create Date : 2007:03:25 18:35:59 Modify Date : 2007:03:25 18:35:59 File Modification Date/Time : 2007:03:25 17:35:59 ======== DSC_1056.NEF Date/Time Original : 2008:06:18 15:10:17 Create Date : 2008:06:18 15:10:17 Modify Date : 2008:06:18 15:10:17 File Modification Date/Time : 2008:06:18 12:10:17 4 image files read C:\nefs>

Note that with the "auto adjust" turned off, all the times change by 2 hours! This has left me scratching my head a little. Looks like the later version of Pearl may be worthy of consideration.

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