| 1 | 1 | 'use strict'; |
| 2 | | |
| 3 | 1 | module.exports = function(date) { |
| 4 | | |
| 5 | 6 | var type = Object.prototype.toString.call(date); |
| 6 | 6 | var now = new Date(); |
| 7 | | |
| 8 | | // convert dateStrings and timestamps to a Date |
| 9 | 6 | if (type === '[object String]' || type === '[object Number]') { |
| 10 | 3 | date = new Date(date); |
| 11 | | } |
| 12 | | |
| 13 | 6 | var yearDiff = now.getFullYear() - date.getFullYear(); |
| 14 | 5 | var monthDiff = now.getMonth() - date.getMonth(); |
| 15 | 5 | var pastDate = now.getDate() < date.getDate(); |
| 16 | | |
| 17 | 5 | if (monthDiff < 0 || (monthDiff === 0 && pastDate)) { |
| 18 | 2 | yearDiff--; |
| 19 | | } |
| 20 | | |
| 21 | 5 | return yearDiff; |
| 22 | | |
| 23 | | }; |