How to compare two different date formats in javascript

Question

Hi all I am new to date time things in javascript. I am facing one issue while comparing two different date formats. Objective- I want to compare date/time coming from the backend with the current time. If time coming from backend is past time I need to do some other stuff or if it is in future I want to do something else.

Issue- Current date format is something like this - Mon Jan 10 2022 16:38:58 GMT+0530 (India Standard Time) Date Time getting from backend is like - 2022-01-03T18:30:00Z

Code -

 $scope.getTimeDifference = function(meetingsData){ meetingsData.forEach(function (arrayItem) { var currentTime = new Date(); var x = arrayItem.meetingTime; console.log(x); console.log(currentTime) if(x < currentTime){ console.log("meeting is in the past"); } else{ console.log("Meeting is in future"); } });

Output - Meeting is in future

Issue - Using this code I am getting meetings in future, but all the meeting time is actually past time. How can I resolve this issue?

If you create a new Date from the string the backend gives you, you can compare them — Luca Kiebel
– Luca Kiebel, Commented Jan 10, 2022 at 11:21
Does this answer your question? Comparing dates in Javascript and timezones — pilchard
– pilchard, Commented Jan 10, 2022 at 11:23
@LucaKiebel okay thank you I got it I converted the date coming from backend !! — Chitrang Sharma
– Chitrang Sharma, Commented Jan 10, 2022 at 11:36

mplungjan · Accepted Answer · 2022-01-10 11:37:22Z

new Date will take either format.

const d1 = new Date("Mon Jan 3 2022 16:38:58 GMT+0530 (India Standard Time)") const d2 = new Date("2022-01-03T18:30:00Z") console.log(d1) console.log(d2) if (d1 < d2) console.log("Date 1 is earlier than d2") // To find hh:mm:ss difference for the same day we can do this. console.log(new Date(d2-d1).toISOString().substr(11, 8))

If you want difference in days, hours etc, you will need more code easily found at SO

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