-IPTC:TimeCreated time zone

[dwlott]

Please help me understand where ExifTool finds the timezone for the -IPTC:TimeCreated tag. 

ExifTool appends the timezone to IPTC:TimeCreated after an increment time command. I want to understand where the timezone value comes from.

Reading -IPTC:TimeCreated, the value returned value is 10:20:50

I am using this command to increment the time by 5 hours.

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-IPTC:TimeCreated+="05:00:00"
After the command, I see the value returned is 15:20:50-05:00. -05:00 is the Florida time zone, and now that it shows up, I need a second command to change the timezone to France +01:00.

I tried the following command in hopes of repairing the time and timezone simultaneously, but it only changed the time. 

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-IPTC:TimeCreated+="05:00:00+06:00"
After ExifTool appends the timezone, ExifTool can change it using the following command.

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-IPTC:TimeCreated+="00:00:00+06:00"

I intend to make web videos about using ExifTool to repair time values, so any information you can provide on this topic is appreciated.

I'm using this reference:   ExifTool Date/Time Shift Module

[StarGeek]

The IPTC:TimeCreated requires a time zone and when one isn't provide, exiftool uses the current system time zone. Even trying to write it with the -n (--printConv) option still adds a time zone. See this very old post.

Does your original file have an IPTC:TimeCreated without a time zone? That will probably require separate processing.

[dwlott]

Thank you Stargeek for helping me understand the source of the timezone value.  That's all I needed.
The original IPTC:TimeCreated values were written by my Nikon D750.