如何修复MomentJS和Asp.net Core之间的时差

Question

I have a date that is set in my UI from this angularjs date picker . It is set as a moment.js object and it includes a GMT offset for my timezone (Eastern). When I submit the moment object back to my Asp.net Core endpoint, the time is converted to the time with no offset. So for example, when I inspect date in the javascript moment object object:

timeIn: Fri Dec 16 2016 05:00:00 GMT-0500 (Eastern Standard Time)

And when I inspect my object in .net core:

TimeIn: 12/16/2016 10:00:00AM

I want the data on the back end to show as the exact time entered on the UI, regardless of timezone. So if they enter 5:00AM, the time backend should store is 5:00AM. It appears to change the value when the moment object is converted to JSON to send to the backend. When I do a JSON.stringify() of my timeIn object on the UI, I get:

"2016-12-16T10:00:00.000Z"

Is there a way to strip the offset data from the timezone on the front end so that the time entered is the exact same as the time sent?

PS I know there are a lot of questions out there about time but I wasn't able to find a suitable one for my case. Thanks for your help

EDIT: I am using .net DateTime object to accept the javascript date object.

Answer 1

This format contains 5 spaces:

Fri Dec 16 2016 05:00:00 GMT-0500 (Eastern Standard Time)

And we can assume 20 to be a minimum, safe entry for landing in the year. Get the next occurrence of space character and split from there.

Note: This one is totally based on assumptions, but it looks like it works better.

You can do something like:

 var time = "Fri Dec 16 2016 05:00:00 GMT-0500 (Eastern Standard Time)"; console.log(time.substr(0, time.indexOf(" ", 20))); 

Also, with reference to How to get the nth occurrence in a string? , we can achieve something better.

function getPosition(string, subString, index) {
   return string.split(subString, index).join(subString).length;
}

We need the 5th occurrence of the space:

 function getPosition(string, subString, index) { return string.split(subString, index).join(subString).length; } var time = "Fri Dec 16 2016 05:00:00 GMT-0500 (Eastern Standard Time)"; console.log(time.substr(0, getPosition(time, " ", 5))); 

The second method seems to be a better one than the first.

The third method is to use the Moment.js library to format the time into a format accepted by .Net:

timeIn = timeIn.format('MM-DD-YYYY h:mm:ss');