close

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
}

Example:

Step 2: type in " daydiff today '3 Dec' ". It will calculate the difference of days between today and Dec 3th.

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