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Average between Dates

To my surprise, doing something like this is not possible in (PL)SQL:
This is a relatively elegant workaround:

Timestamp to Date

Don't use:
But use:
In "normal" queries the first method works, but it won't work correctly in views.

For "non-truncated" days, use:

Difference between Timestamps


Result: 339280881.056293 seconds

Unix (Epoch) time

Unix (Epoch) time is the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, minus leap seconds.

To calculate the number of milliseconds elapsed since then, taking your timezone into account, use this query:
Result: 1601577681061 milliseconds

Timezones

Conversion of a date from a timezone to the "database timezone":
and vice versa: