如何在 python 中使用 365 天格式计算两个日期/时间列表之间的时差？

Question

I have two lists of dates and times in the following format: YYYY:DDD:HH:MM:SS:mmm (mmm is miliseconds).

I am getting these times from another list using regular expressions.

for line in start_list 
    start_time = re.search(r'((\d\d\d\d):(\d*):(\d\d):(\d\d):(\d\d):(\d\d\d))')
for line in end_list 
    end_time = re.search(r'((\d\d\d\d):(\d*):(\d\d):(\d\d):(\d\d):(\d\d\d))')

I could do a for loop cycling through start_time, and have a counter to keep track of the current line for end_time. I'm not really sure the best way to execute it. I cant seem to figure out how to cycle through each line in each list to calculate the time difference between them. Any help would be very greatly appreciated.

Answer 1

You can convert to datetime objects and then just subtract the first series to the second as eg:

import pandas as pd

start_list_pts=[date.replace(":",".") for date in start_list]
end_list_pts=[date.replace(":",".") for date in end_list]

start_datetimes=pd.to_datetime(start_list_pts,format='%Y.%j.%H.%M.%S.%f')
end_datetimes=pd.to_datetime(end_list_pts,format='%Y.%j.%H.%M.%S.%f')

dts=start_datetimes-end_datetimes

Your milliseconds were not a fraction of your seconds that's why I changed the separator to points. You can of course also only change the last one!