I'm storing my own copy of Google Analytics session data and I'm trying to figure out their schema.
I'm trying to figure out why does Google Analytics end sessions at midnight?
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Midnight is the logic time to end a session - if there has to be a specific time at which each and every session, no matter how long it is open has to be ended.
Even if it might seem stupid to count two sessions for a user visiting from 11:55pm - and leaving after 10 minutes. You might want to count visits per day/week/month/year. An in this case there has to be some kond of delimiter. As each day/week/month/year ends/begins at midnight, this is the right time to end one session amn start a new one.
Instead of the 10 minutes example, take a 10 hours session. Wouldn't you want to have a 5 hours session on, let's say march 31 and 1st of april, instead of 10 hours on the march 31?
From Google Analytics Help : How a session is defined in Analytics https://support.google.com/analytics/answer/2731565?hl=en
End of day expiry
Bob opens your website at 11:50 PM on the 14th of August and leaves your website at 12:10 AM on the 15th of August.
The first session ends at 11:59:59 PM on the 14th of August, and the second session begins at 12:00 AM on the 15th of August.
End of day is determined by your view timezone settings.