method to display float in datetime format

I need a method in c# that makes me a string that look like a datetime out of a double/fl开发者_StackOverflow社区oat.

for example

1.5 -> 01:30 2.8 -> 02:48 25.5 -> 25:30 (note: don't display as day, display full hours even its more than 24)

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It sounds to me like you don't want a DateTime - you want a TimeSpan:

TimeSpan ts = TimeSpan.FromMinutes(x);

or

TimeSpan ts = TimeSpan.FromHours(x);

(depending on your exact requirement).

Note that "2.8" won't be exactly 2.8, so you may not get exactly the result you expect - for the normal reasons of floating point bases etc.

Although there's no custom formatting for TimeSpan values in currently released version of the framework, it's coming in .NET 4.0.

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Try the following:

string ToTime(double hours)
{
    var span=TimeSpan.FromHours(hours);
    return string.Format("{0}:{1:00}:{2:00}",
        (int)span.TotalHours, span.Minutes, span.Seconds);
}

Or if you don't want seconds:

string.Format("{0}:{1:00}", (int)span.TotalHours, span.Minutes)