Getting date yyyymmdd format in Shell Script is something tricky. I have spent almost 15 minutes to get this format, this may be helpful for someone to save their time.

1. Date YYYYMMDD format in Shell Script:

The syntax for getting today’s date in yyyymmdd format in the shell script.

$date +%Y%m%d
20190928 -- output

2. The Day Before Dates in YYYYMMDD format:

We can also send parameter to date command to get the day before dates, for instance, yesterday, the day before yesterday and so on.

#Yesterday date
$date --date="1 days ago" +%Y%m%d
20190927  --output

#2 days before date
$date --date="2 days ago" +%Y%m%d
20190926  --output

3. Shell Script:

#!/bin/bash

FORMATE_DATE='date --date="2 days ago" +%Y%m%d'

echo "The day before yesterday - ${FORMATE_DATE}"

Output:

$./date_format.sh
The day before yesterday - 20190926

Done!

Happy Learning 🙂