* @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 date to be changed
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* @param month - The month index to set (0-11)
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*
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* @returns The new date with the month set
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*
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* @example
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* // Set February to 1 September 2014:
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* const result = setMonth(new Date(2014, 8, 1), 1)