BASH > les dates

Calculer le nombre  de jours entre deux dates

#!/bin/bash
datum1=`date -d "1991/1/1" "+%s"`
datum2=`date "+%s"`
diff=$(($datum2-$datum1))
days=$(($diff/(60*60*24)))
echo $days

 

date en secondes (UNIX epoch)

date --date '2017-08-17 04:00:01' +%s    # "1502938801"

 

passage de secondes (UNIX) en date

date --date '@1502938801'    # "17 Aug 2017 04:00:01"

 

Calculer la différence entre deux timestamps

#!/usr/bin/env bash
deb=$(date -jf "%Y-%m-%d %H:%M:%S" "${startDatetime}" +%s)
fin=$(date -jf "%Y-%m-%d %H:%M:%S" "${endDatetime}" +%s)
diffSec="$(($fin-$deb))"
echo "Diff in seconds: $diffSec"
diff=$(gdate -d@${diffSec} -u +%H:%M:%S) # apt install coreutils
echo "Diff time(H:M:S): $diff"

Output:

Diff in seconds: 654289
Diff time(H:M:S): 13:44:49

 

 

#!/usr/bin/env bash
deb=$(date -d "2020-05-21 05:52:47" +%s)
fin=$(date -d "2020-05-28 19:37:36" +%s)
diffSec="$(($fin-$deb))"
echo "Diff in seconds: $diffSec"
diff=$(date -d @${diffSec} +"%H:%M:%S" -u)
echo "Diff time(H:M:S): $diff"

Output:

Diff in seconds: 654289
Diff time(H:M:S): 13:44:49