How do I convert a datetime to this? [duplicate] - javascript

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In Javascript, I have a datetime string that looks like:
2021-03-12 19:52:09
How do I convert it so it appears in this format?
03/12 12:34pm PST
Ideally I would like to do so without external libraries.

You could format it manually like this:
now = Date.now();
pst = new Date(now-(8*60*60*1000)); //-8 hours for pst
pst_str = `${pst.getMonth()}/${pst.getDate()} ${pst.getHours()%12}:${pst.getMinutes()}${pst.getHours()>=12?'pm':'am'} PST`;

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I have a JSON file with date format in the form of
2021-09-21 15:37:29.590 +03:00.
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You can pass it into the Date constructor and call toISOString.
const convert = (dateString) => new Date(dateString).toISOString();
console.log(convert('2021-09-21 15:37:29.590 +03:00')); // 2021-09-21T12:37:29.590Z

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I would like to get date format like "20/06/2019 13:20:04.8517209" in Javascript
Try this:
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For cleaner version try to use moment js: https://momentjs.com/
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How convert localString date to new Date? [duplicate]

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I have local string date: 12/3/2018, 12:00:00 AM.
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console.log(a);

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I have something like
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