How to convert an interval like “1 day 01:30:00” into “25:30:00”?

Question

I need to add some intervals and use the result in Excel.

Since

sum(time.endtime-time.starttime)

returns the interval as \"1 da

Answer 1

You could use EXTRACT to convert the interval into seconds.

SELECT EXTRACT(EPOCH FROM INTERVAL '5 days 3 hours');
Result: 442800

Then you would need to do your own maths (or let Excel do it).

Note that '1 day' is not necessarily equivalent to '24 hours' - PostgreSQL handles things like an interval that spans a DST transition.