CODEWITHSUNDEEP
bashunixtime
EmaK
EmaK

Reputation: 87

How to Set UNIX HH:MM:SS to a Date time to calculate time difference

I want to calculate the difference in time by passing in a string HH:MM value to set the time and calculating the difference between this and the current system time.

I'm aware of date --set="2013-07-10"+%T (or something like this). But I cannot figure out how to set the time part to be the string HH:MM value that I pass in and leave the data as the current date. Then, to calculate I was trying to use the below which changes it into a timestamp value; which I found from another user:

mydate=??
date1=$($mydate +"%s")  #my set date/time here
date2=$(date +"%s")
diff=$(($date2-$date1))
echo "$(($diff / 60)) minutes and $(($diff % 60))"

Upvotes: 0

Views: 3761

Answers (1)

dogbane
dogbane

Reputation: 274632

You can use date -d hh:mm to create a new date with a specified time.

Example:

$ date -d 11:15
Wed Jul 10 11:15:00 BST 2013

Using this, you can write the following script:

time=11:15

now=$(date +%s)
other=$(date -d $time +%s)
diff=$((other-now))
echo "$((diff / 60)) minutes and $((diff % 60)) seconds"

Upvotes: 2

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