Microsoft JSON dates are formatted as a string with the following format:

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/Date(millisecondsSinceUnixEpoch)/

For example, the date 2023-05-15 00:00:00 UTC would be formatted as follows:

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/Date(1652454400000)/

To format a Microsoft JSON date, you can use the following steps:

1. Get the date object.
2. Use the getTime() method to get the number of milliseconds since the Unix epoch.
3. Use the toUTCString() method to convert the number of milliseconds to a string in UTC format.
4. Surround the string with forward slashes (/).

Here is an example of how to format a Microsoft JSON date:

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const date = new Date();
const jsonDate = `/Date(${date.getTime()})/`;

The jsonDate variable will now contain the date formatted in Microsoft JSON format.

You can also use the following function to format a Microsoft JSON date:

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function formatMicrosoftJSONDate(date) {
  return `/Date(${date.getTime()})/`;
}

Here is an example of how to use the formatMicrosoftJSONDate() function:

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const date = new Date();
const jsonDate = formatMicrosoftJSONDate(date);

The jsonDate variable will now contain the date formatted in Microsoft JSON format.