index.js
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var parse = require('../parse/index.js')
/**
* @category Common Helpers
* @summary Compare the two dates and return -1, 0 or 1.
*
* @description
* Compare the two dates and return 1 if the first date is after the second,
* -1 if the first date is before the second or 0 if dates are equal.
*
* @param {Date|String|Number} dateLeft - the first date to compare
* @param {Date|String|Number} dateRight - the second date to compare
* @returns {Number} the result of the comparison
*
* @example
* // Compare 11 February 1987 and 10 July 1989:
* var result = compareAsc(
* new Date(1987, 1, 11),
* new Date(1989, 6, 10)
* )
* //=> -1
*
* @example
* // Sort the array of dates:
* var result = [
* new Date(1995, 6, 2),
* new Date(1987, 1, 11),
* new Date(1989, 6, 10)
* ].sort(compareAsc)
* //=> [
* // Wed Feb 11 1987 00:00:00,
* // Mon Jul 10 1989 00:00:00,
* // Sun Jul 02 1995 00:00:00
* // ]
*/
function compareAsc (dirtyDateLeft, dirtyDateRight) {
var dateLeft = parse(dirtyDateLeft)
var timeLeft = dateLeft.getTime()
var dateRight = parse(dirtyDateRight)
var timeRight = dateRight.getTime()
if (timeLeft < timeRight) {
return -1
} else if (timeLeft > timeRight) {
return 1
} else {
return 0
}
}
module.exports = compareAsc