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I have a countup app. Here is the thing: https://stackblitz.com/edit/web-platform-mjepwa?file=main.js]

I have this code in my function. It sets from when the timer starts counting. past = Date.parse('2023-02-8 02:20:00'); I want to set the timer with "type="datetime-local" input.

I have no idea how to do it. Thanks in advance!

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  • You can change your Date.parse(<date>) to use whatever the value of the input is. For example: var elem = document.querySelector("input.time-input"); var tm = elem.value; if(!tm) { tm = new Date(); tm = tm.toISOString(); } Is that what you had in mind? Commented Feb 10, 2023 at 22:34
  • @FiddlingAway—see Why does Date.parse give incorrect results? If the !tm test fails, then tm is a string and tm.toISOString() will throw an error. Hence answers should be as answers, not in comments. Commented Feb 13, 2023 at 5:00
  • Questions should include minimal code to demonstrate the issue, not reference code posted elsewhere. Commented Feb 13, 2023 at 5:03
  • @RobG Are you sure it will throw an error? Unless I'm misunderstanding you, this var tm = ""; if(!tm) { tm = new Date(); tm = tm.toISOString(); console.log(tm); } is showing what it's supposed to show: 2023-02-13T19:33:14.452Z at the time of posting this comment. Commented Feb 13, 2023 at 19:35
  • @FiddlingAway—the OP wants to use a time input, not datetime. If a value has been set, it will be like "19:33", which will be parsed as an invalid date and toISOString will throw a range error (or similar). Commented Feb 14, 2023 at 12:02
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