在javascript中打印日期，如“Ymd H:i:s”

Question

Is there a built in way in javascript that formats a date object in a format like “Ymd H:i:s”?

I use

var since= new Date(xhr.getResponseHeader("Last-Modified"));
alert("modified:: " +since.getDate()+'.'+(since.getMonth()+1)+'. '+ since.getHours()+':'+since.getMinutes())

But that cuts off all leading zeros

Answer 1

You can try this:

function LeadingZero(s,max) {
    var z = max-s.length+1;
    z = z>1 ? Array(z).join('0') : '';
    return (z + s);     
}

alert("modified:: " +LeadingZero(since.getDate(),2)+'.'+LeadingZero(since.getMonth()+1,2)+'. '+ LeadingZero(since.getHours(),2));

But I recommend using Moment.js , a library for handling dates in JS. It has built in a formatter and can do a lot of other stuff.

In moment you can do it this way:

var d = moment(since);
alert(d.format('YYYY-MM-DD HH:mm:ss'));

Answer 2

Use this function:

function pad(number) {
  if ( number < 10 ) {
    return '0' + number;
  }
  return number;
}

pad(since.getDate())+'.'+pad(since.getMonth()+1)+'. '+ pad(since.getHours())+':'+pad(since.getMinutes())

For Ymd H:i:s format use following example:

pad(since.getFullYear()) + '-' + pad(since.getMonth()+1) + '-' + pad(since.getDate()) + ' ' + pad(since.getHours()) + ':' + pad(since.getMinutes()) + ':' + pad(since.getSeconds())