使用自定义日期格式对对象进行排序

Question

Help please me with sorting. I have to sort object with custom string date

var object = [{
  name: "something",
  date: "23.12.2016"
},
{
  name: "something2",
  date: "19.12.2016"
}]

how sort object like this? I already tried with sort function return new Date(a.date) - new Date(b.date); but had nothing it doesn't work Thanks !

Answer 1

You could split the date and rearrange it as iso date and sort by string with localeCompare .

 var object = [{ name: "something", date: "23.12.2016" }, { name: "something2", date: "19.12.2016" }]; object.sort(function (a, b) { var aa = a.date.split('.'), bb = b.date.split('.'); return [aa[2], aa[1], aa[0]].join('-').localeCompare([bb[2], bb[1], bb[0]].join('-')); }); console.log(object); 

You could use as well String#replace for reordering the string.

 var object = [{ name: "something", date: "23.12.2016" }, { name: "something2", date: "19.12.2016" }]; object.sort(function (a, b) { var aa = a.date.replace(/(..).(..).(....)/, '$3-$2-$1'), bb = b.date.replace(/(..).(..).(....)/, '$3-$2-$1'); return aa.localeCompare(bb); }); console.log(object); 

Answer 2

The solution using Date.parse() and String.prototype.replace() functions(to sort by timestamps ):

 var date_objects = [{ name: "something", date: "23.12.2016" }, { name: "something2", date: "19.12.2016" }]; date_objects.sort(function(a,b){ return Date.parse(a.date.replace(/^(\\d{2})\\.(\\d{2})\\.(\\d{4})$/, '$3-$2-$1')) - Date.parse(b.date.replace(/^(\\d{2})\\.(\\d{2})\\.(\\d{4})$/, '$3-$2-$1')) }); console.log(date_objects); 

Answer 3

Out of curiosity, I tried a variation about Nina Scholz's answer , maybe it's faster, maybe not. I find reformatting the date quite obvious, but it's also time-consuming. In my version the duplicate indices are probably a problem, but as you stated that the format is zero-padded , this will work:

 var object = [{ name: "something", date: "23.12.2016" }, { name: "something2", date: "19.12.2016" }]; object.sort(function (a, b) { return (a.date[6] - b.date[6]) || (a.date[7] - b.date[7]) || (a.date[8] - b.date[8]) || (a.date[9] - b.date[9]) || (a.date[3] - b.date[3]) || (a.date[4] - b.date[4]) || (a.date[0] - b.date[0]) || (a.date[1] - b.date[1]); }); console.log(object);