如何在 Python 中找到两个日期时间对象之间的毫秒差异？

Question

I have two datetime objects which are 02:49:01.210000 and 02:49:01.230000:

RA_1 = datetime.datetime.strptime(obs_data['RA'][3], "%H:%M:%S.%f").time()
RA_2 = datetime.datetime.strptime(pred_data['RA'][3], "%H:%M:%S.%f").time()

How do I workout the difference between these two times in milliseconds?

I tried doing RA_1 - RA_2 but got the error:

unsupported operand type(s) for -: 'datetime.time' and 'datetime.time'

I also tried using total_seconds() but got the error:

'datetime.time' object has no attribute 'total_seconds'

Answer 1

This is how you can compute the different between two time objects. It is a hack which involves adding the same date to both objects.

By construction it assumes both times relate to the same day.

from datetime import datetime, date, time

obs_data = {'RA': "22:24:05.52" }
pred_data = {'RA':"22:24:05.60"}

RA_1 = datetime.strptime(obs_data['RA'], '%H:%M:%S.%f').time()
RA_2 = datetime.strptime(pred_data['RA'], '%H:%M:%S.%f').time()

diff = datetime.combine(date.today(), RA_2) - datetime.combine(date.today(), RA_1)
diff.total_seconds() * (10 ** 3)
# 80.0 [ms]