Javascript date constructor on Cordova WP8

Question

I have a date string in the format 28-Dec-2016 04:25 AM and need to convert it to a Date object. For this, I first split the string to get the date and time

cDateStringParts = cdate.split(' ');

Then I get the date and time components

cDateParts = cDateStringParts[0].split('-');
cTimeParts = cDateStringParts[1].split(':');

Then I initialize the Date object like

if(cDateStringParts[2]=='AM'){
    cDateObject = new Date(cDateParts[2], convertToNumericMonth(cDateParts[1]), cDateParts[0], cTimeParts[0], cTimeParts[1], 0, 0);
} else {
    cDateObject = new Date(cDateParts[2], convertToNumericMonth(cDateParts[1]), cDateParts[0], complaintTimeParts[0] + 12, cTimeParts[1], 0, 0);
}

where convertToNumericMonth() is a function which converts Jan-Dec to 0-11.But I do not get the correct values when I check cDateObject.getDate()/getMonth()/getYear(). The result is 2017/12/29.

What am I doing wrong? If I try to do alert(cdate,' ',cDateObject.getFullYear() I get this:

why you are splitting into date use directly var date = new Date('28-Dec-2016 04:25 AM') it converts in date object — Santosh Shinde, Dec 29 '16 at 06:33
if you are checking in browser console then its give me result — Santosh Shinde, Dec 29 '16 at 06:37
Wed Dec 28 2016 04:25:00 GMT+0530 (IST) and if you access the date.getFullYear() then it returns 2016 — Santosh Shinde, Dec 29 '16 at 06:38
In the WP8 emulator it gives `NaN/12/29`, checking using alert() — S_S, Dec 29 '16 at 06:40
Please give me value ,which passed to date object from your exact code — Santosh Shinde, Dec 29 '16 at 07:00
Possible duplicate of [Parse DateTime string in JavaScript](http://stackoverflow.com/questions/1576753/parse-datetime-string-in-javascript) — Heretic Monkey, Dec 29 '16 at 21:44

score 1 · Accepted Answer · answered Dec 29 '16 at 21:31

One issue is how 12hr time is converted to 24hr time. The date parts are strings, so for "03:45 PM" the following:

complaintTimeParts[0] + 12

will return "0312". Also, "12:00 AM" should have the hours set to 0, but your code will set the hours to 12.

The hours can be converted to 24hr time by converting to a number first, converting 12am to 0 and then adding 12 if it's PM. Also simpler if done separately from the rest of the calculation:

var hr = cTimeParts[0] % 12 + (cDateStringParts[2]=='AM'? 0 : 12);

Here the mod operator % will convert cTimeParts[0] to a number. Now the function can be:

function dateParse(cdate) {
  var cDateStringParts = cdate.split(' ');
  var cDateParts = cDateStringParts[0].split('-');
  var cTimeParts = cDateStringParts[1].split(':');
  var hr = cTimeParts[0] % 12 + (cDateStringParts[2]=='AM'? 0 : 12);
  return new Date(cDateParts[2], convertToNumericMonth(cDateParts[1]),
                  cDateParts[0], hr, cTimeParts[1]);
}

function convertToNumericMonth(month) {
  return {Jan:0,Feb:1,Mar:2,Apr:3,May:4,Jun:5,Jul:6,
          Aug:7,Sep:8,Oct:9,Nov:10,Dec:11}[month];
}

console.log(dateParse('28-Dec-2016 04:25 AM').toString());
console.log(dateParse('28-Dec-2016 04:25 PM').toString());

Lastly, missing parts are set to 0 (or 1 for the date) so they don't need to be included.

score 0 · Answer 2 · edited May 23 '17 at 12:33

0

This link might be a solution for your issue.

you cannot actually rely on the date parsing because, it is dependent on multiple factors like time zones, daylight saving etc.

you could also check your device's time zone and time settings because, the browser uses system data for parsing date.

i have checked the same logic on my browser and it worked fine for me.

here is the example.

if it is working this way, the issue would be that the values calculated by cDateParts is generating different values(very less possibility).

hope this would help you.

edited May 23 '17 at 12:33

Community

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answered Dec 29 '16 at 06:42

Prashanth Benny

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It works this way, but in case my time is in PM, I was adding 12 to hours being passed, which creates the problem. – S_S Dec 29 '16 at 09:11
@Sumit i am not sure why its not working proper.. its working like a charm on my pc – Prashanth Benny Dec 29 '16 at 09:48

Javascript date constructor on Cordova WP8

2 Answers2