Step 1:
vi .bashrc
write the code as below:
# calculate diference between two days
daydiff() {
d1=$(date -d "$1" +%s)
d2=$(date -d "$2" +%s)
echo $(( (d1 - d2) / 86400 )) days
}
Step 2: type in " daydiff today '3 Dec' ". It will calculate the difference of days between today and Dec 3th.
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