CODEWITHSUNDEEP
c#asp.netsql-server-2008
Praveen Singh
Praveen Singh

Reputation: 39

How to add hours?

How to add below two drop-down hours as follows below:-

In my app I have a drop-down box of strings that shows possible hours in 12-hour time for the user to select

9am
9.30am
10am
10.30am
11am
11.30am
12pm
12.30pm
etc,

And another drop-down box of strings that shows possible hours like

1hour
2hour
3hour
etc

When user select first drop-down after that he/she select second drop-down then i want to add these values and select difference of hours like

if user select

first value=11.30pm

second value=2hours

then ,i want to show End Time=1.30AM

Upvotes: 2

Views: 705

Answers (1)

Tim Schmelter
Tim Schmelter

Reputation: 460340

You can use a combination of DateTime.ParseExact, int.Parse, DateTime.AddHours and DateTime.ToString:

DateTime dt = DateTime.ParseExact("11.30am", "hh.mmtt", CultureInfo.InvariantCulture); 
var digits = "2hours".TakeWhile(Char.IsDigit);  // take only the first digit(s)
int hours = int.Parse(new string(digits.ToArray()));
String result = dt.AddHours(hours).ToString("h.mmtt", CultureInfo.InvariantCulture);

Result: 1.30PM (so your desired result is incorrect because it's PM instead of AM)

In your case you have to handle the DropDownList's SelectedIndexChanged-events and use the SelectedValue property. But you should use more maningful values in the ListItems anyway.

For example:

<asp:DropDownList id="DdlTime" runat="server"
     OnSelectedIndexChanged="OnSelectedIndexChangedMethod">

   <asp:ListItem value="690">
      11.30am
   </asp:ListItem>
   etc.... 
</asp:DropDownList>

Here you can use TimeSpan.FromMinutes(int.Parse(ddlTime.SelectedValue)) to get the TimeSpan or directly DateTime.Today.AddMinutes(int.Parse(ddlTime.SelectedValue)).

Upvotes: 4

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