Calculate DATEDIFF in POSTGRES using SQLAlchemy

Question

I need to calculate DATEDIFF in minutes between 2 columns of timestamp type. There are so many simple examples on the web, but none of them

Answer 1

PostgreSQL does not have a datediff function. To get the number of minutes, use the SQL expression:

trunc((extract(epoch FROM newer_date) - extract(epoch FROM older_date)) / 60)

• extract(epoch FROM …) converts the timestamp to number of seconds.
• / 60 converts to seconds to minutes
• trunc(…) removes the fractional part.

So probably try

sa.func.trunc((
    sa.extract('epoch', datetime.utcnow()) -
    sa.extract('epoch', datetime.utcnow())
) / 60)