find the time difference between two strings of fixed format as "DDD MMM dd hh:mm:ss HKT YYYY"

Asked Feb 21 '23 at 06:17

Active Feb 21 '23 at 07:50

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I grepped from the start time and end time strings from the program log. How can I find the time difference in hour?

t1="Tue Feb 21 12:15:00 HKT 2023"
t2="Tue Feb 21 12:45:01 HKT 2023"

I looked at other questions. But they have either different formats or directly from date like date -d 'now + 3 weeks'

edited Feb 21 '23 at 07:50

roaima

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asked Feb 21 '23 at 06:17

SBMVNO

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Will the start and end always be on the same date? – roaima Feb 21 '23 at 06:24
YES, since they are from the existing program log. – SBMVNO Feb 21 '23 at 06:25
Does HKT jump forwards/backwards during the year? (It does in some countries, but not in others.) – roaima Feb 21 '23 at 06:26
What have you tried so far? – roaima Feb 21 '23 at 06:26
I think HKT means HongKongTime. I never see others. – SBMVNO Feb 21 '23 at 06:27
What system is this running on (UNIX, Mac, Linux,...?) – roaima Feb 21 '23 at 06:29
Please do not reply here in the comments. Instead, update your question to include the requested detail. This improves your question and makes it easier for the next person to try and help you – roaima Feb 21 '23 at 06:29

1 Answers1

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Like this:

#!/bin/bash

export TZ='Asia/Hong_Kong'
oldd=$(date -d "Tue Feb 21 12:15:00 HKT 2023" "+%s")
last=$(date -d "Tue Feb 21 12:45:01 HKT 2023" "+%s")
diff=$((last - oldd))
echo "$((diff/3600 )) hours $(( (diff/60)%60 )) minutes $(( diff%60 )) seconds"

Output

0 hours 30 minutes 1 seconds

answered Feb 21 '23 at 07:25

Gilles Quénot

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