* @summary Get the number of full months between the given dates.
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*
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* @description
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* Get the number of full months between the given dates using trunc as a default rounding method.
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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 dateLeft - The later date
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* @param dateRight - The earlier date
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*
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* @returns The number of full months
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*
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* @example
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* // How many full months are between 31 January 2014 and 1 September 2014?
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* const result = differenceInMonths(new Date(2014, 8, 1), new Date(2014, 0, 31))