如何使用JSON格式的日期过滤数据

Question

I want to filter using date but the data is in JSON format. How can I filter the large dataset using date in JavaScript?

Example:

data=[{date:'22-12-2014',name:'selva'},{date:'10-10-2010',name:'raja'},{date:'11-11- 2011',name:'suresh'}]

Answer 1

If you simply want to filter data by time, you can look through all objects in the array like this:

var filteredData = [];

for(var index in data) {
    var obj = data[index];
    var date = parseDate(obj.date);

    //Filter dates from 2011 and newer
    if(date > new Date(2011, 0, 1))
        filteredData.push(obj);
}

function parseDate(dateStr) {
    var date = dateStr.split('-');
    var day = date[0];
    var month = date[1] - 1; //January = 0
    var year = date[2];
    return new Date(year, month, day); 
}

//Filtered data now contains:
// [{"date":"22-12-2014","name":"selva"},{"date":"11-11- 2011","name":"suresh"}] 

I am sure you could do the parse date better, by for example defining the date in a format that the Date constructor accepts.

Answer 2

To grab the set of elements that match a certain date you can use filter to extract them into a new array.

function getByDate(date){
  return data.filter(function (el) {
    return el.date == date;
  });
}

var arr = getByDate('11-11-2011');

To to sort your dataset by date you need to convert your date strings to a JS date object first. That involves adjusting the date string slightly so it can be parsed properly.

function reformatDate(date) {
  return arr = date.split('-').reverse();
}

var sortByDate = function (a, b) {
  return new Date(reformatDate(a.date)) - new Date(reformatDate(b.date));
};

data.sort(sortByDate);

JSFiddle demo

Answer 3

To fetch the set of elements that match a certain date you can use filter to extract them into a new array.

var tempArray=   data.filter(function (d, i) {
    return d >= startDate && d <= endDate;
})

Answer 4

I used date format MM/DD/YY. Here is the full example -

 var data=[ {date:'02/10/2018',name:'date is 10'}, {date:'02/14/2018',name:'date is 14'}, {date:'02/16/2018',name:'date is 16'}, {date:'02/20/2018',name:'date is 20'}, {date:'02/24/2018',name:'date is 24'}, {date:'02/26/2018',name:'date is 26'}, {date:'02/30/2018',name:'date is 30'}, {date:'03/01/2018',name:'date is 01'}, {date:'03/05/2018',name:'date is 05'}, {date:'02/23/2018',name:'date is name 23'}, ] var today = new Date(); var todayTime = new Date().getTime(); var days_after_20 = new Date().setDate(today.getDate()+20); var days_before_5 = new Date().setDate(today.getDate()-5); var result = data.filter(function (item) { var itemTime = new Date(item.date).getTime() return itemTime >= days_before_5 && itemTime <= days_after_20; }) console.log(result);