Date.prototype.getDay() — Return value
An integer, between 0 and 6, representing the day of the week for the given date according to local time: 0 for Sunday, 1 for Monday, 2 for Tuesday, and so on.
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An integer, between 0 and 6, representing the day of the week for the given date according to local time: 0 for Sunday, 1 for Monday, 2 for Tuesday, and so on. Returns NaN if the date is invalid.
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MDN Web Docs — files/en-us/web/javascript/reference/global_objects/date/getday/index.md :: Return value ↗Revision d14bee540b53 · CC-BY-SA-2.5