Transform a C# DateTime object into a JavaScript date format

Question

Transform a C# DateTime object into a JavaScript date format

In my Javascript function, I am handling a C# DateTime received from MVC. If the date is null, it should return "-", and if it's a valid date, it should be returned in the formatted date.

IMPORTANT: The date must be sent in the specified format from C# and cannot be changed.

Javascript:

function CheckDate(date) {

  if (date === "Mon Jan 01 0001 00:00:00 GMT+0000 (GMT Daylight Time)")
    return "-";
  else {
    var parsedDate = new Date(date);
    return parsedDate.getFullYear() + '/' + parsedDate.getMonth() + '/' + parsedDate.getDate();
  }

Any suggestions for an improved method to compare dates with C# New DateTime?

Additionally, how can I parse and return the date in "yyyy/MM/dd" format?

c#javascript datetime-format

Answer 1

Answer №1

When dealing with the current output, it seems challenging to find a more effective way to capture a DateTime value of 0 on the JavaScript side.

To address your parsing requirements, utilizing Date.parse should suffice, however, keep in mind that it returns the number of milliseconds, requiring wrapping a Date constructor around it:

var date = new Date(Date.parse(myCSharpString));

~~To obtain the desired return date, you can use:~~

date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + (date.getDate() + 1);

(Keep in mind that date.getMonth and date.getDate are indexed differently.)

~~Fiddle: http://jsfiddle.net/GyC3t/~~

EDIT Thanks to JoeB's observation, a correction is needed. The date.getMonth() function follows a 0-indexed format, while the date.getDate() function is 1-indexed. The previous solution "worked" due to the local time aspect in the fiddle example. For accuracy, consider the following approach:

For the return date, simply utilize:

date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + (date.getUTCDate());

(Note that date.getMonth is 0-indexed, whereas date.getDate is susceptible to time-zone differences and operates on a 1-indexed basis.)

Fiddle: http://jsfiddle.net/GyC3t/25/

Answer 2

When dealing with the current output, it seems challenging to find a more effective way to capture a DateTime value of 0 on the JavaScript side.

To address your parsing requirements, utilizing Date.parse should suffice, however, keep in mind that it returns the number of milliseconds, requiring wrapping a Date constructor around it:

var date = new Date(Date.parse(myCSharpString));

~~To obtain the desired return date, you can use:~~

date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + (date.getDate() + 1);

(Keep in mind that date.getMonth and date.getDate are indexed differently.)

~~Fiddle: http://jsfiddle.net/GyC3t/~~

EDIT Thanks to JoeB's observation, a correction is needed. The date.getMonth() function follows a 0-indexed format, while the date.getDate() function is 1-indexed. The previous solution "worked" due to the local time aspect in the fiddle example. For accuracy, consider the following approach:

For the return date, simply utilize:

date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + (date.getUTCDate());

(Note that date.getMonth is 0-indexed, whereas date.getDate is susceptible to time-zone differences and operates on a 1-indexed basis.)

Fiddle: http://jsfiddle.net/GyC3t/25/

Answer 3

Answer №2

To transfer a JavaScript Date to C#, I utilize the following method:

var now = new Date();
var date = (now.getTime() / 86400000) - (now.getTimezoneOffset() / 1440) + 25569;

If you receive the milliseconds from C#, the process would look something like this:

var csharpmilliseconds;
var now = new Date();
var date = new Date((csharpmilliseconds + (now.getTimezoneOffset() / 1440) - 25569) * 86400000);

Answer 4

To transfer a JavaScript Date to C#, I utilize the following method:

var now = new Date();
var date = (now.getTime() / 86400000) - (now.getTimezoneOffset() / 1440) + 25569;

If you receive the milliseconds from C#, the process would look something like this:

var csharpmilliseconds;
var now = new Date();
var date = new Date((csharpmilliseconds + (now.getTimezoneOffset() / 1440) - 25569) * 86400000);

Answer 5

Answer №3

I have created a modified version that I believe is more user-friendly

/// <summary>
/// Initiating Javascript Date
/// </summary>
static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

/// <param name="ms">From js Date.getTime()</param>
/// <returns>Date in UTC, use ToLocalTime()</returns>
public static DateTime ConvertFromJavascriptMs(string ms)
{
    var milliseconds = double.Parse(ms);
    DateTime result = UnixEpoch.AddMilliseconds(milliseconds);
    return result;
}

public static double ConvertToJavascriptMs(DateTime date)
{
    TimeSpan duration = date.Subtract(UnixEpoch);
    return duration.TotalMilliseconds;
}

Answer 6

I have created a modified version that I believe is more user-friendly

/// <summary>
/// Initiating Javascript Date
/// </summary>
static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

/// <param name="ms">From js Date.getTime()</param>
/// <returns>Date in UTC, use ToLocalTime()</returns>
public static DateTime ConvertFromJavascriptMs(string ms)
{
    var milliseconds = double.Parse(ms);
    DateTime result = UnixEpoch.AddMilliseconds(milliseconds);
    return result;
}

public static double ConvertToJavascriptMs(DateTime date)
{
    TimeSpan duration = date.Subtract(UnixEpoch);
    return duration.TotalMilliseconds;
}

Transform a C# DateTime object into a JavaScript date format

Answer №1

Answer №2

Answer №3

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