Issue time converting to 24 hours when i write time on asp.net web forms?-CodePudding

I working on with C# and ASP.NET webforms using Visual Studio 2022. I have an issue when trying to write time to a textbox.

When I try to write time 11:30 pm to a textbox, it is converted automatically to 23:30 - why was it converted?

I need time to working on 12 hours mode exactly as I write it.

So if I write 11:30 am, it must be shown as 11:30 am.

11:30 pm must be shown as 11:30 pm - here I have the issue that it is converted to 23:30 pm.

Expected result:

when I write 11:30 pm, it must show 11:30 pm

What do I do to solve this issue please?

webpage.cs

protected void txtFromTime_TextChanged(object sender, EventArgs e)
{
        var Transactiondate = Convert.ToDateTime(txtDate.Text);
        var dateonly = Transactiondate.ToString("dd/MM/yyyy");
       var eventDate = txtDate.Text   " "  Convert.ToDateTime(txtFromTime.Text).ToString("HH:mm");
      
        Label1.Text = eventDate.ToString();
}

web page.aspx

<form id="form1" runat="server">
    <div>
        <asp:Label ID="lblDate" runat="server" Text="Date" ></asp:Label>
        <asp:TextBox ID="txtDate" runat="server" TextMode="Date" AutoPostBack = "True" OnTextChanged="txtDate_TextChanged"></asp:TextBox>
        <asp:Label ID="lblFromTime" runat="server" Text="FromTime"></asp:Label>
        <asp:TextBox ID="txtFromTime" runat="server" TextMode="Time" AutoPostBack = "True"  OnTextChanged="txtFromTime_TextChanged"></asp:TextBox>
    </div>
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>

picture issue

Image for issue time

CodePudding user response：

It's because you used upper-case HH instead of lower-case hh in the format string. You also need the AM/PM indicator:

hh:mm tt

This is well-documented:

In other words, you have one text box - it will have both date and time for you.

About the only thing I don't like, is tab key does not select, you have to hit enter key.

but, it also allows in-line editing if you don't want to use the picker.

Hence this:

And if you enter (without the picker), then you have to use arrow keys to move to the next part. Again, I don't find this 100% intuitive.

However, you can drop in 2 controls, and feed it the "one" date time variable. You feed using "iso" date format, but it will take on your local settings.

So, say this markup:
        <h4>Enter Date</h4>
        <asp:TextBox ID="txtDate" runat="server"
            TextMode="Date">
        </asp:TextBox>

        <h4>Enter Time</h4>
        <asp:TextBox ID="txtTime" runat="server"
            TextMode="Time">
        </asp:TextBox>
And code to load:
            DateTime dtStart = DateTime.Now;

            txtDate.Text = dtStart.ToString(@"yyyy-MM-dd");
            txtTime.Text = dtStart.ToString(@"HH:mm");
NOTE close above, I feed the time a 24 hour format, but it does display in 12 hour format.

and now we get/see this: