A question recently on StackOverflow.com triggered me to think that it would be nice if in JavaScript I could do this:
var d = new Date();
d.AddDays(1);
So exactly like what I can do in .NET. I know a lot of people try and achieve date solutions by concatenating strings and parsing as a date, but this is not an option for me as JavaScript’s native DateTime is very powerful and due to this, there is absolutely no need to be hashing together strings. So I will now paste the functionailty in C# that I based my methods on, dead simple, it is:
DateTime d = new DateTime();
public void Page_Load(object sender, EventArgs e)
{
DateTime days = d.AddDays(1);
DateTime hours = d.AddHours(1);
DateTime milliseconds = d.AddMilliseconds(1);
DateTime minutes = d.AddMinutes(1);
DateTime months = d.AddMonths(1);
DateTime seconds = d.AddSeconds(1);
}
So to exploit another JavaScript feature I will use prototype to extend the methods of the Date type inside javascript. C# now has extension methods which are quite similar in what they allow you to use them like. So the prototypes I want to create are as follows:
- AddDays
- AddHours
- AddMilliseconds
- AddMinutes
- AddMonths
- AddSeconds
<script type="text/javascript">
Date.prototype.AddDays = function(days) {
this.setDate(this.getDate() + days);
return this;
}
Date.prototype.AddHours = function(hours) {
this.setHours(this.getHours() + hours);
return this;
}
Date.prototype.AddMilliseconds = function(milliseconds) {
this.setMilliseconds(this.getMilliseconds() + milliseconds);
return this;
}
Date.prototype.AddMinutes = function(minutes) {
this.setMinutes(this.getMinutes() + minutes, this.getSeconds(), this.getMilliseconds());
return this;
}
Date.prototype.AddMonths = function(months) {
this.setMonth(this.getMonth() + months, this.getDate());
return this;
}
Date.prototype.AddSeconds = function(seconds) {
this.setSeconds(this.getSeconds() + seconds, this.getMilliseconds());
return this;
}
Date.prototype.AddYears = function(years) {
this.setFullYear(this.getFullYear() + years);
return this;
}
</script>Excellent, nice clean, precise code. So with this I can now do the following:
<script type="text/javascript">
var d = new Date();
var output = d.AddDays(1).toString() + "<br/>" +
d.AddHours(1).toString() + "<br/>" +
d.AddMilliseconds(1).toString() + "<br/>" +
d.AddMinutes(1).toString() + "<br/>" +
d.AddMinutes(1).toString() + "<br/>" +
d.AddMonths(1).toString() + "<br/>" +
d.AddSeconds(1).toString() + "<br/>" +
d.AddYears(1).toString() + "<br/>";
document.write(output);
</script>With the output of
Sat Mar 07 2009 08:41:09 GMT+0000 (GMT Standard Time)
Sat Mar 07 2009 09:41:09 GMT+0000 (GMT Standard Time)
Sat Mar 07 2009 09:41:09 GMT+0000 (GMT Standard Time)
Sat Mar 07 2009 09:42:09 GMT+0000 (GMT Standard Time)
Sat Mar 07 2009 09:43:09 GMT+0000 (GMT Standard Time)
Tue Apr 07 2009 09:43:09 GMT+0100 (GMT Daylight Time)
Tue Apr 07 2009 09:43:10 GMT+0100 (GMT Daylight Time)
Wed Apr 07 2010 09:43:10 GMT+0100 (GMT Daylight Time)
Obviously if you want to subtract values from a date you would provide negative values into the methods, i.e. DateTime.AddDays(-10);
Cheers for now,
Andy