Hi Simon:

Speaking from close to no knowledge here...

Is it that critical to know both start and end times of an export? Can you 
perhaps average them to one value?

Can you assume DateTime is UTC with your particular files and use cases?

Not sure if this is helpful, just posing a simple position as a starting 
premise.

W. Kemp Watson
Objective Pathology Services
Toronto,  Canada

http://www.objectivepathology.com

[email protected]
tel. +1 (647) 783-4431

> On May 12, 2022, at 2:42 PM, Simon (Vsevolod) Ilyushchenko 
> <[email protected]> wrote:
> 
> 
> Hi,
> 
> I work on the Google Earth Engine team. Our users are asking about a standard 
> way to set start/end time on geotiffs exported from Earth Engine. I know 
> about TIFFTAG_DATETIME, but it has no timezone. In any case, we'd like to use 
> two different time tags for start and end.
> 
> What would be the most standards-compliant way of setting datetimes?
> 
> Thanks,
> Simon
> 
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