I am trying to filter an array which contain date(converted from string) which is greater than a particular date..

_this.downloadData.forEach(_d => _d.LogTime = _d.LogTime.toString());

console.log(_this.downloadData.filter(x=>new Date(x.LogTime) > new Date('3/11/2019 7:29:12 AM')));

But filter always return zero items

.

Array looks like below:

[0 … 99]
0:
CPUStat:""
Connectivity:""
DiskStatus:""
HostName:"HOSTname"
LastRebootStatus:null
LogTime:"Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)"

__proto__:
Object

I am trying to filter an array which contain date(converted from string) which is greater than a particular date..

_this.downloadData.forEach(_d => _d.LogTime = _d.LogTime.toString());

console.log(_this.downloadData.filter(x=>new Date(x.LogTime) > new Date('3/11/2019 7:29:12 AM')));

But filter always return zero items

.

Array looks like below:

[0 … 99]
0:
CPUStat:""
Connectivity:""
DiskStatus:""
HostName:"HOSTname"
LastRebootStatus:null
LogTime:"Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)"

__proto__:
Object

• javascript
• jquery
• string
• typescript
• date

• No even i have many records greater than and less thanDate('3/11/2019 7:29:12 AM') none of them filter , always return zero – SmartestVEGA Commented Mar 11, 2019 at 12:32
• 1 Did you check the date in array after converting it to string value? – Thamarai T Commented Mar 11, 2019 at 12:35
• LogTime:"Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)" this is the value after converting – SmartestVEGA Commented Mar 11, 2019 at 12:37
• 2 What absolute time are you expecting new Date('3/11/2019 7:29:12 AM') to be? It doesn't indicate a time zone. – Mark Commented Mar 11, 2019 at 12:39
• its client side scrpting so zone doesnt matter i hope – SmartestVEGA Commented Mar 12, 2019 at 12:01

2 Answers 2

Most of your problem here consist of the date time format not being ISO 8601 pliant. Because of this you need to clean up the date. LogTime.substring(4,23) + obj.LogTime.substring(28,33) will get the important parts from your string. Then you can use moment.js (https://momentjs.), which is a must for handling time in JavaScript.

You can run the code below and see that it works

// Your example time array
let timeArray = [
  { LogTime:"Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)" },
  { LogTime:"Mon Mar 11 2019 08:39:12 GMT+0530 (India Standard Time)" },
  { LogTime:"Mon Mar 11 2019 09:39:12 GMT+0530 (India Standard Time)" },
  { LogTime:"Mon Mar 11 2019 10:39:12 GMT+0530 (India Standard Time)" }
 ],
 format = "MMM MM YYYY HH:mm:ssZ",
    shouldBeAfter = moment('Mar 11 2019 09:00:12+0530', format),
    result,
    filterDateGreaterThan = function (obj){
      let sDate,
          mDate;
      
      sDate = obj.LogTime.substring(4,23) + obj.LogTime.substring(28,33);
      mDate = moment(sDate, format);
      // console.log(mDate);
      return mDate.isAfter(shouldBeAfter);
    };
 result = timeArray.filter(filterDateGreaterThan);
 console.log(result);

<script src="https://momentjs./downloads/moment.min.js"></script>

Code when not using Moment.js

// Your example time array
let timeArray = [
  { LogTime:"Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)" },
  { LogTime:"Mon Mar 11 2019 08:39:12 GMT+0530 (India Standard Time)" },
  { LogTime:"Mon Mar 11 2019 09:39:12 GMT+0530 (India Standard Time)" },
  { LogTime:"Mon Mar 11 2019 10:39:12 GMT+0530 (India Standard Time)" }
 ],
    shouldBeAfter = new Date('Mar 11 2019 09:00:12+0530'),
    result,
    filterDateGreaterThan = function (obj){
      let sDate,
          date;
      
      sDate = obj.LogTime.substring(4,23) + obj.LogTime.substring(28,33);
      date = new Date(sDate);
      return date.valueOf() > shouldBeAfter.valueOf();
    };
 result = timeArray.filter(filterDateGreaterThan);
 console.log(result);

You should be able to fix your problem by adding a timezone to your input. If you don't provide a timezone, your browser will use your local timezone. For instance, my timezone is PDT, so I end up seeing this:

Without Timezone in input:
input  : 3/11/2019 7:29:12 AM
output : Mon Mar 11 2019 07:29:12 GMT-0700 (Pacific Daylight Time)

With Timezone in input:
input  : Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)
output : Sun Mar 10 2019 19:09:12 GMT-0700 (Pacific Daylight Time)

Note that with the timezone in your input, the unix timestamp matches the output.

I personally use Moment Timezone to handle these cases.

Without Timezone in input:
input  : moment.tz("3/11/2019 7:29:12 AM", "Asia/Calcutta").toDate();
output : Mon Mar 11 2019 00:29:12 GMT-0700 (Pacific Daylight Time)

With Timezone in input:
input  : moment.tz("Mon Mar 11 2019 07:39:12 GMT+0530 (India Standard Time)", "Asia/Calcutta").toDate();
output : Mon Mar 11 2019 00:39:12 GMT-0700 (Pacific Daylight Time)