var differenceInMilliseconds = require('../difference_in_milliseconds/index.js')
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var MILLISECONDS_IN_HOUR = 3600000
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/**
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* @category Hour Helpers
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* @summary Get the number of hours between the given dates.
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*
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* @description
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* Get the number of hours between the given dates.
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*
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* @param {Date|String|Number} dateLeft - the later date
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* @param {Date|String|Number} dateRight - the earlier date
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* @returns {Number} the number of hours
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*
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* @example
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* // How many hours are between 2 July 2014 06:50:00 and 2 July 2014 19:00:00?
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* var result = differenceInHours(
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* new Date(2014, 6, 2, 19, 0),
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* new Date(2014, 6, 2, 6, 50)
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* )
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* //=> 12
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*/
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function differenceInHours (dirtyDateLeft, dirtyDateRight) {
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var diff = differenceInMilliseconds(dirtyDateLeft, dirtyDateRight) / MILLISECONDS_IN_HOUR
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return diff > 0 ? Math.floor(diff) : Math.ceil(diff)
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}
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module.exports = differenceInHours
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