CODEWITHSUNDEEP
c#timedatetime-format
Gayan
Gayan

Reputation: 2871

Create a List of hours

I'm trying to create list of hours my code like 

 var hours = Enumerable.Range(00, 24).Select(i => i.ToString("D2")));

it generates something like this in 24 hour format but actually i need same thing not on 24 hours but 12 like after with AM PM postfix

what is the best way to generate hour list with 00.00 AM/PM formatted

Thanks

Upvotes: 2

Views: 4526

Answers (5)

Artur Kedzior
Artur Kedzior

Reputation: 4263

If you need more flexibility and have from/to for specific times that overlap midnight (and increase step to let's say every 2h) you can use something like this:

private static IEnumerable<string> GetListOfHours(DateTime start, DateTime end, int step)
{
    while (start <= end)
    {
        yield return start.ToString("hh.mm tt");
        start = start.AddHours(step);
    }
}

So this:

var start = DateTime.Now.Date.AddHours(6); // 6 am
var end = DateTime.Now.AddDays(1).Date.AddHours(2); // 2 am
var step = 1;

var list = GetListOfHours(start, end, step);

Will produce this:

06.00 AM
07.00 AM
08.00 AM
09.00 AM
10.00 AM
11.00 AM
12.00 PM
01.00 PM
02.00 PM
03.00 PM
04.00 PM
05.00 PM
06.00 PM
07.00 PM
08.00 PM
09.00 PM
10.00 PM
11.00 PM
12.00 AM
01.00 AM
02.00 AM

https://dotnetfiddle.net/8LYxA6

Upvotes: 0

Yuliam Chandra
Yuliam Chandra

Reputation: 14640

You can create a DateTime instance then use ToString format of hh.mm tt.

var hours = Enumerable.Range(00, 24)
    .Select(i => new DateTime(2000,1,1,i,0,0).ToString("hh.mm tt"));

You need to execute the query using something like ToArray() to get the result since the behavior of linq is deferred execution.

Upvotes: 8

jmcilhinney
jmcilhinney

Reputation: 54427

var hours = Enumerable.Range(00, 24).Select(i => (DateTime.MinValue.AddHours(i)).ToString("hh.mm tt"));

Upvotes: 5

MarcinJuraszek
MarcinJuraszek

Reputation: 125630

You're dealing with time, so using appropriate type, DateTime, seems better than using int:

var hours = from i in Enumerable.Range(0, 24)
            let h = new DateTime(2014, 1, 1, i, 0, 0)
            select h.ToString("t", CultureInfo.InvariantCulture);

Upvotes: 3

Denis Shulepov
Denis Shulepov

Reputation: 381

var startDate = DateTime.Today;
IEnumerable<DateTime> listOfHours = Enumerable.Range(0, 24).Select(h => startDate.AddHours(h));

Upvotes: 1

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