* @summary Subtract the specified number of months from the given date.
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*
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* @description
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* Subtract the specified number of months from the given date.
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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 date to be changed
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* @param amount - The amount of months to be subtracted.
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*
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* @returns The new date with the months subtracted
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*
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* @example
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* // Subtract 5 months from 1 February 2015:
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* const result = subMonths(new Date(2015, 1, 1), 5)