Created
October 17, 2012 11:02
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Javascript date time helpers
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| //##Gets x days Ago## | |
| Date.prototype.daysAgo = function (days) { | |
| if (isNaN(days) || (days ==0)) { | |
| return; | |
| } | |
| this.setDate(this.getDate() - days); | |
| } | |
| //##Gets x weeks Ago## | |
| Date.prototype.weeksAgo = function (weeks) { | |
| if (isNaN(weeks) || (weeks ==0)) { | |
| return; | |
| } | |
| this.setDate(this.getDate() - (weeks*7)); | |
| } | |
| //##Gets x months Ago## | |
| Date.prototype.monthsAgo = function (months) { | |
| if (isNaN(months) || (months ==0)) { | |
| return; | |
| } | |
| var month = this.getMonth(); | |
| this.setMonth(month - months); | |
| while(this.getMonth() == month) { | |
| this.daysAgo(1); | |
| } | |
| } | |
| //##Gets day count in year## | |
| Date.prototype.getDayOfYear = function () { | |
| var year = this.getFullYear(); | |
| var month = this.getMonth()+1; | |
| var days = this.getDate(); | |
| for (var i = 1; i < month; i+=1) { | |
| days+=new Date(year, i, 0).getDate(); | |
| } | |
| return days; | |
| } | |
| //##Gets week count in year## | |
| Date.prototype.getWeekOfYear = function () { | |
| var days = this.getDayOfYear(); | |
| //Sunday is 0, Monday is 1, and so on. | |
| var firstDay = new Date(this.getFullYear(), 0, 1).getDay(); | |
| var offset = 7 - firstDay; | |
| var week = 0; | |
| if (days <= offset) { | |
| week = 1; | |
| } else { | |
| week = parseInt((days - 1 - offset) / 7) + 2 | |
| } | |
| return week; | |
| } |
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