Time Zone

[Ray]

Hi Phil,

Is it possible to use one single Windows Exiftool command to change the time zone and all tags with date / time using the if statement?  For example, I would like to change some of the NEF files with time zone tag = 8 to time zone = 6, and also change all other date / time tags accordingly base on the revise time zone.

Thanks a lot.

Ray

[Phil Harvey]

Hi Ray,

I am assuming that you are talking about XMP tags?  (In general, other tags don't have time zone information.)

If so, you can do something like this:

exiftool -if "$xmp:createdate =~ /\+08:00/" -xmp:createdate-=+02:00 FILE

or equivalently, you could have used "-xmp:createdate+=-02:00".

- Phil

[Ray]

Hi Phil,

I tried your command
exiftool -if "$xmp:createdate =~ /\+08:00/" -xmp:createdate-=+02:00 *.NEF
but got the message:
5 files failed condition

Here are my NEF files:
exiftool  -timezone -createdate *.NEF
======== 2014-09-18_11-07-59_DSC_8991.NEF
Timezone                        : +01:00
Create Date                     : 2014:09:18 19:07:59
======== 2014-09-18_17-11-39_DSC_8992.NEF
Timezone                        : +08:00
Create Date                     : 2014:09:19 01:11:39
======== 2014-09-18_17-46-10_DSC_8993.NEF
Timezone                        : +08:00
Create Date                     : 2014:09:19 01:46:10
======== 2014-09-18_17-46-37_DSC_8994.NEF
Timezone                        : +08:00
Create Date                     : 2014:09:19 01:46:37
======== 2014-09-18_17-47-32_DSC_8995.NEF
Timezone                        : +08:00
Create Date                     : 2014:09:19 01:47:32
    5 image files read

Any idea?

Thanks,
Ray

[Hayo Baan]

There is no timezone info in the createdate so the condition failed. The timezone info you want to change is in the timezone MakerNotes instead. So, in the command, change createdate to timezone (remove any xmp: part) and you should be fine.

[Ray]

Thanks Hayo.  You are correct.  I need to use timezone instead of createdate.  Besides, I think I also need to change the createdate separately as it will not be automatically re-calculated base on the new timezone.

[Phil Harvey]

Ah.  This is the Nikon TimeZone tag?  That tag is not shiftable using the syntax I gave.  Instead, you could do this:

exiftool -if "$timezone eq '+08:00'" -timezone="+06:00" FILE

And yes, you would also have to shift any other date/time tags separately.  You could do this in the same command.

- Phil

[Ray]

Hi Phil,

Yes, I think this is Nikon TimeZone tag.  I need to rename the files again after correcting the date/time tags.  How can I concatenate the date/time tages with FileNumber to rename the files eg original file 2014-09-18_17-11-39_DSC_8992.NEF should now be renamed as 2014-09-18_11-11-39_DSC_8992.NEF (8992 is the FileNumber) after shifting the time zone.

Thanks,

Ray

[Phil Harvey]

You can use %%-4f in a date/time format string (-d option) to give you the last 4 characters of the old filename when copying a date/time value to a file name.

- Phil

[Ray]

Hi Phil,

Many thanks for the help.  I reset the TimeZone tags and renamed  the files.  They are now in correct order 

Ray