Use if to write to label

[Whaler]

My apologies in advance for what is probably a simple problem.
I have thousands of photos that have inconsistent time stamps that I would like to resolve. I have been successful at changing the incorrect time stamps as I find them but am looking for a way to mark the files that need correction.
I had hoped to compare the [XMP-exif] Date/Time Digitized with the [XMP-photoshop] Date Created and if they don't match to set the [XMP-xmp] Label to read "Wrong Time Stamp"

I have tried several variations of the following line:

-label=Wrong Time Stamp -if "$datecreated ne $datetimedigitized"
Unfortunately everything I've tried writes to the label even when the two time stamps do match.

Any help would be greatly appreciated.

[StarGeek]

Can you provide an example file where this doesn't work?

Using -if "$DateCreated ne $DateTimeDigitized" works in my tests, so there's something else going on here.

[Whaler]

I am trying to attach the photo, I had to resize it because of a time out or size issue warning but after resizing I get the following message:
"Your attachment has failed security checks and cannot be uploaded. Please consult the forum administrator"

[Whaler]

Here is a link to the photo in OneDrive if that helps.
https://1drv.ms/u/s!AvEzEqbwrin4r5RdMSjHMeUHD2p5dQ

[StarGeek]

The problem is that this image also has an IPTC:DateCreated tag which is taking priority over the XMP:DateCreated  The IPTC tag is only the date (2018:04:21).  This is normal as the IPTC:DateCreated is defined as only holding the date value.  The XMP:DateCreated includes the time and time zone (2018:04:21 06:47:01-07:00).  So obviously, "2018:04:21" is not equal to "2018:04:21 06:47:01-07:00". 

Change your command to -if "$XMP:DateCreated ne $XMP:DateTimeDigitized" and it should work as you want.

[Whaler]

Thanks StarGeek, that worked.
Much appreciated.