2022.05.12 20:09 "Re: [Tiff] best tiff tag names for start and end datetimes?", by Simon (Vsevolod) Ilyushchenko

1. Bob: The reason I'd like to have the option of timezones is that modern timestrings like ISO8601 often have them, so using Z to indicate UTC (which is indeed the majority of our timestamps) would both handle the common case and allow the possibility of using other timezones.

2. Kemp: It's not just for Google, but I don't know how broadly this would be used. AFAIK, the immediately adjacent community of people using big data and remote sensing have not settled on any standard yet, but it seems like the right time to establish one.

3. Even: yes, I'm not quite sure whether this should be handled on GDAL or TIFF level. Other GDAL-readable format like netcdf-cf have time standards already, but yes, geotiffs (and lately COGs = cloud-optimized geotiffs <https://www.cogeo.org/>) are the lingua franca of our community. Setting GDAL fields START_DATE and END_DATE indeed feels like a good solution, so I wanted to find out how to do this properly in the hope of creating a standard.