Moment.js - Shell/Bash

Introduction

As a developer, we often need to work with dates and times. Moment.js is a popular JavaScript library that makes it easy to work with dates and times in JavaScript. However, if you are working with Shell or Bash scripts, you can also use Moment.js to manipulate dates and times. In this article, we will explore how to use Moment.js in Shell/Bash scripts.

Installation

To use Moment.js in your Shell/Bash script, you need to install Moment.js first. You can download the latest version of Moment.js from the official website or use a package manager like npm or yarn. Here is how you can install Moment.js using npm:

npm install moment --save

Usage

Once you have installed Moment.js, you can start using it in your Shell/Bash script. Here are some examples of how to use Moment.js:

Get the current date and time

To get the current date and time, you can use the date command in Shell/Bash:

now=$(date +"%Y-%m-%d %H:%M:%S")
echo $now

Output:

2021-11-18 20:38:45

Alternatively, you can use Moment.js to get the current date and time:

now=`node -p "require('moment')().format('YYYY-MM-DD HH:mm:ss')"`
echo $now

Output:

2021-11-18 20:38:45

Add/Subtract days

To add or subtract days from a specific date, you can use Moment.js:

date="2021-11-18"
next_day=`node -p "require('moment')('$date').add(1, 'days').format('YYYY-MM-DD')"`
echo $next_day

Output:

2021-11-19

Compare dates

To compare two dates, you can use Moment.js:

date1="2021-11-18"
date2="2021-11-19"
if [ `node -p "require('moment')('$date1').isBefore('$date2')" == "true" ]; then
  echo "date1 is before date2"
else
  echo "date1 is after date2"
fi

Output:

date1 is before date2

Conclusion

In this article, we have learned how to use Moment.js in Shell/Bash scripts to manipulate dates and times. Moment.js is a powerful and flexible library that makes working with dates and times a lot easier in JavaScript as well as other programming languages.