How JavaScript handles a tutorial for a specified date a few months ago or months later

In common project development process, often encounter needs in JavaScript processing time, nothing but two (1, Logic processing 2, Format conversion processing). Of course, the relevant technology blog, the garden is closed with eyes can catch one, but I have to do is: since I have been fortunate to encounter, we should be as far as possible analysis into their best for their own things, become a part of their knowledge base, and hope to help the needy students to solve the problems encountered in the relevant small.

Time Logic Processing

Common requirements for this type are: To calculate today's date for a few months (before).

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/** * Get input date a few months ago *{param:datetime} date Input date (YYYY-MM-DD) Number of *{param:number} monthnum months */ Getpremonthday:function (Date,monthnum) { Vardatearr = Date.split ('-'); Varyear = datearr[0];//Gets the year of the current date Varmonth = datearr[1];//Gets the month of the current date Varday = datearr[2];//Gets the current date of the day Vardays =newdate (year, month, 0); Days = Days.getdate ();//Get the number of months in the current date VARYEAR2 = year; Varmonth2 = parseint (month)-monthnum; if (Month2 <=0) { Year2 = parseint (year2)-parseint (MONTH2/12 = 0 1:parseint (month2)/12); Month2 =-(Math.Abs (month2)% 12); } Varday2 = day; Vardays2 =newdate (year2, month2, 0); Days2 = Days2.getdate (); if (Day2 > Days2) { Day2 = Days2; } if (Month2 < 10) { Month2 = ' 0 ' + month2; } Vart2 = year2 + '-' + month2 + '-' + day2; Returnt2; }

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/** * Get the entry date for the next one months *{param:datetime} date Input date (YYYY-MM-DD) Number of *{param:number} monthnum months */ Getnextmonthday:function (date, monthnum) { Vardatearr = Date.split ('-'); Varyear = datearr[0];//Gets the year of the current date Varmonth = datearr[1];//Gets the month of the current date Varday = datearr[2];//Gets the current date of the day Vardays =newdate (year, month, 0); Days = Days.getdate ();//Get the number of months in the current date VARYEAR2 = year; Varmonth2 = parseint (month) + parseint (monthnum); if (Month2 >12) { Year2 = parseint (year2) + parseint (parseint (month2)/= = 0 1:parseint (month2)/12)); Month2 = parseint (month2)% 12; } Varday2 = day; Vardays2 =newdate (year2, month2, 0); Days2 = Days2.getdate (); if (Day2 > Days2) { Day2 = Days2; } if (Month2 < 10) { Month2 = ' 0 ' + month2; } Vart2 = year2 + '-' + month2 + '-' + day2; Returnt2; }

Test effect:

The hair did not find a problem, through 29th to push, before and after will be 29. January 31 to February is February 29 (because February is 29 days).

Then this logic has to be changed according to the actual situation for some requirements. For example: I would like to pay a deposit of one months. At present I have paid the 2.1-2.29 (February month), the deposit one months should be (3.1-3.31). Through this logic is 3.1-3.29, so use please according to the actual situation!

Original link: http://www.cnblogs.com/peixuanzhihou/p/6204551.html