How to create countdown using javaScript or jQuery??

Question

simple count down using javaScript or jquery

Answer 1

https://code.sololearn.com/Wwt0X6LUx62Q/?ref=app

Answer 2

https://www.w3schools.com/howto/howto_js_countdown.asp

(in addition) perhaps the following template will be useful:
https://code.sololearn.com/W7hSW0U4WQo1/?ref=app

Answer 3

https://code.sololearn.com/Wt7K7MGvgG1I/?ref=app

Answer 4

https://code.sololearn.com/W3Qb8m7SLcKG/?ref=app