Question

I have current date in javascript like below:

self.currentDate = ko.observable(new Date());

I want to format the date in yyyy-mm-dd and use inside Sammy like below:

this.get('', function () { this.app.runRoute('get', '#'+self.currentDate()) });

There are so many long process to do it. But is there any way to do it easily. Or can i use it inside document.ready function and used it here.

Answer 1

Take a look at datejs.

http://www.datejs.com/

It’s a Javascript date library, which will handle your format conversion. It extends the toString method so that you can accomplish stuff like:-

self.currentDate().toString('yyyy-M-d')

There are a couple of options for integration with Knockout, but the above will “work” in returning a yyyy-mm-dd format.

Another approach, still using datejs, is to wrap the function in a ko.computed:-

self.displayDate = ko.computed(function(){
   return self.currentDate().toString('yyyy-M-d');
});

If you don’t want to use datejs, you can roll your own and wrap it in a computed.

self.displayDate = ko.computed(function(){
   var year = self.currentDate().getFullYear().toString();
   var month = (self.currentDate().getMonth() + 1).toString();
   var day   = self.currentDate().getDay().toString();
   var pad = "00";

   return year + '-' +
     pad.substring(0, pad.length, month.length ) + month + '-' +
     pad.substring(0, pad.length, day.length ) + day;

});

But seriously, look at datejs first. Why re-invent the wheel. Can’t really help you on the Sammy part, soz.