Hello @nartabaza,
yes, submissin_time is with a timezone and related to the server, whereas start and end relate to the local device (except duplicate case option on server edit). IYou can see the full datetime string in the case modal view and in Excel (download) in the edit widget on top when you click on the cell.
When you edit a case, only the end variable will change.
Using the (recommended) search function of the forum, you can find more information, e.g.
https://community.kobotoolbox.org/t/multiple-submissions-randomly-appeared-all-at-once-on-server-days-to-weeks-after-submitting/31465/3.
Sometimes, there may also be an issue with a wrong date/time/timezone configuration of the local device. See https://forum.getodk.org/t/starttime-greater-than-endtime/18586/10
