Checking Date and Time in JavaScript

Question

Checking Date and Time in JavaScript

I'm struggling with validating a date time string in Javascript, based on the language set in the browser.

For example, if the language is set to pt-BR, the format would be

dd/MM/yyyy HH:mm:ss

I attempted to use the following code:

var dateFormat = "dd/MM/yyyy HH:mm:ss";
var x = Date.parseExact($("#theDate").val(), dateFormat);

However, x always returns Null. I suspect Date.parseExact doesn't support times. I need a solution that works for all browser languages without relying on another library. Regular expressions are not an option due to the complexity of writing multiple expressions.

Any suggestions on how to proceed? I'm open to using a webmethod as well.

I tested the following webmethod, which works for en-US but not other languages:

Public Function ValidateDates(ByVal strDate_In As String) As String
    Dim theFormat As String = CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern() + " " + CultureInfo.CurrentCulture.DateTimeFormat.LongTimePattern()
    Try
        Dim d As DateTime = DateTime.ParseExact(strDate_In, theFormat, CultureInfo.CurrentCulture)
        Return "true"
    Catch ex As Exception
       Return "false"
    End Try
End Function

javascript asp.net vb.net

Answer 1

Answer №1

One way to achieve this is by using Regex:

var dateFormat = "dd/MM/yyyy HH:mm:ss";
var x = $("#theDate").val().match(/^(\d{2})\/(\d{2})\/(\d{4}) (\d{2}):(\d{2}):(\d{2})$/);
console.log(x);

Check out the demonstration here: https://jsfiddle.net/kzzn6ac5/

update You can try out this updated regex pattern and customize it as needed:

^((\d{2}|\d{4})[\/|\.|-](\d{2})[\/|\.|-](\d{4}|\d{2}) (\d{2}):(\d{2}):(\d{2}))$

This pattern matches dates in formats like yyyy/mm/dd hh:mm:ss or dd/mm/yyyy hh:mm:ss with separators /.-.

See the updated demo here: https://jsfiddle.net/kzzn6ac5/1 or refer to this link for more details.

You can explore additional Regex patterns related to date matching here.

Answer 2

One way to achieve this is by using Regex:

var dateFormat = "dd/MM/yyyy HH:mm:ss";
var x = $("#theDate").val().match(/^(\d{2})\/(\d{2})\/(\d{4}) (\d{2}):(\d{2}):(\d{2})$/);
console.log(x);

Check out the demonstration here: https://jsfiddle.net/kzzn6ac5/

update You can try out this updated regex pattern and customize it as needed:

^((\d{2}|\d{4})[\/|\.|-](\d{2})[\/|\.|-](\d{4}|\d{2}) (\d{2}):(\d{2}):(\d{2}))$

This pattern matches dates in formats like yyyy/mm/dd hh:mm:ss or dd/mm/yyyy hh:mm:ss with separators /.-.

See the updated demo here: https://jsfiddle.net/kzzn6ac5/1 or refer to this link for more details.

You can explore additional Regex patterns related to date matching here.

Answer 3

Answer №2

In my experience, working with JavaScript date objects can be quite tricky. While the language itself may seem easy to handle, mastering date objects often requires a significant amount of time and effort. Personally, I found it more efficient to let VB or another programming language take care of this task.

However, if you insist on using JavaScript and want to avoid Regex, you could try manipulating the input string directly like so:

try {
    var user_input = $("#theDate").val();
    var split = user_input.split(" "); // 0: date, 1: time
    var split_time = split[1].split(":"); // 0: hours, 1: minutes, 2: seconds

    d.setHours(split_time[0]);
    d.setMinutes(split_time[1]);
} catch {
    // handled as invalid format
}

This code assumes that the input follows a specific format and throws an error if it does not. It's certainly not the most elegant solution, but dealing with JS Date objects can be quite challenging at times.

Answer 4

In my experience, working with JavaScript date objects can be quite tricky. While the language itself may seem easy to handle, mastering date objects often requires a significant amount of time and effort. Personally, I found it more efficient to let VB or another programming language take care of this task.

However, if you insist on using JavaScript and want to avoid Regex, you could try manipulating the input string directly like so:

try {
    var user_input = $("#theDate").val();
    var split = user_input.split(" "); // 0: date, 1: time
    var split_time = split[1].split(":"); // 0: hours, 1: minutes, 2: seconds

    d.setHours(split_time[0]);
    d.setMinutes(split_time[1]);
} catch {
    // handled as invalid format
}

This code assumes that the input follows a specific format and throws an error if it does not. It's certainly not the most elegant solution, but dealing with JS Date objects can be quite challenging at times.

Checking Date and Time in JavaScript

Answer №1

Answer №2

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