* @summary Return the start of an hour for the given date.
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*
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* @description
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* Return the start of an hour for the given date.
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* The result will be in the local timezone.
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*
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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param date - The original date
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*
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* @returns The start of an hour
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*
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* @example
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* // The start of an hour for 2 September 2014 11:55:00:
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* const result = startOfHour(new Date(2014, 8, 2, 11, 55))