Difference between two Timestamps

[TSch]

Hello everyone,

using ksh I need to figure out how many days have passed between a timestamp and the current date of today.

Format of the timestamp is:

YYYYMMDD (e.G. 20200703)

Using

date +%Y%m%d

will give me the correct format for the current date and at first sight simply substracting both is working fine as long as both are within the same month ...

e.G.

20200716 - 20200703

Problem is obvious:

20200801 - 20200703

Any ideas how to solve this ?

Best Regards,
Thomas

 

[feherke]

Hi

Such math is usually done with Unix times :

date='20200703'
echo $(( ($( date +'%s' ) - $( date -d "$date" +'%s' )) / 24 / 60 / 60 ))

Feherke.
feherke.github.io