About This Code
Brief Description:
Javascript version of @Adjust
Contributor:
Andrew Tetlaw
Type:
Date/Time functions
Last Modified:
23 Feb 2007
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Code / Description
I liked the simplicity of being able to adjust a date using @Adjust in Notes and wanted the same simplicity in Javascript. So here it is:
Date.prototype.adjust = function(yr,mn,dy,hr,mi,se) {
var m,t;
this.setYear(this.getFullYear() + yr);
m = this.getMonth() + mn;
if(m != 0) this.setYear(this.getFullYear() + Math.floor(m/12));
if(m < 0) {
this.setMonth(12 + (m%12));
} else if(m > 0) {
this.setMonth(m%12);
}
t = this.getTime();
t += (dy * 86400000);
t += (hr * 3600000);
t += (mi * 60000);
t += (se * 1000);
this.setTime(t);
}
Usage / Example
var d = new Date();
d.adjust(years, months, days, hours, minutes, seconds);
Each argument is required, you pass a positive or negative number to adjust the date by that value or pass 0 for no change.
You can supply positive or negative numbers just like in @Adjust. It copes with year roll over if you, for example, add 15 months or -15 months to the date or even if it's December and you increment the month by 2.
Comments
Posted by mdm adph on 12/20/2006 12:10:25 PMgood code!
very good code -- i'm making this part of my standard utility library right away.
also, thanks for reminding me of the fact that javascript is able to declare multiple variables using just one "var" -- I have no idea why I had forgotten that.
Posted by Andrew Tetlaw on 02/23/2007 06:33:22 PMFixed a bug
Oops, for got JS months were 0 - 11 ! Above code is fixed.
Posted by Rajni Huria on 09/16/2009 05:58:02 PMIts not working for me
when i try to use this code..it returns me "Undefined" value..
Any idea??
-thanks
Posted by Joe Ellis on 08/31/2010 11:54:15 AMfix for "Undefined"
need to add 'return this' as the last line in the function, then it works great. Probably too late to help Rajni, but maybe this will be of use to whoever finds this next.