Python：如何使具有不同单位的两个时间数组具有可比性？

Question

I have the following problem:

I have one time array with " Hours since 1900-01-01 00:00:0.0 " as unit and I want to compare it with a time array with " Seconds since midnight 2016-10-01 00:00:0.0 " as unit. Is there a python function which makes both time arrays comparable?

The motivation behind this task is to compare atmospheric variables derived from aircraft measurements with those from ERA5 reanalysis.

Thanks!

Answer 1

You could transform both to appropriate datetime instances, using your base date and adding the according deltas:

from datetime import datetime, timedelta

a1 = [datetime(1900, 1, 1)) + timedelta(hours=float(t1)) for t1 in time_array_1]
a2 = [datetime(2016, 10, 1)) + timedelta(seconds=float(t2)) for t2 in time_array_2]

The resulting datetime objects are easily comparable via < , > , etc. and you can get their difference as timedelta objects using the normal subtraction operator - .