C# – Convert a Time to a formatted string in C#

cstring-formattingtime

Time.ToString("0.0") shows up as a decimal "1.5" for instead of 1:30. How can I get it to display in a time format?

private void xTripSeventyMilesRadioButton_CheckedChanged(object sender, EventArgs e)
{
    //calculation for the estimated time label
    Time = Miles / SeventyMph; 
    this.xTripEstimateLabel.Visible = true;
    this.xTripEstimateLabel.Text = "Driving at this speed the estimated travel time in hours is: " + Time.ToString("0.0") + " hrs";
}

Best Answer

Time.ToString("hh:mm")

Formats:

HH:mm  =  01:22  
hh:mm tt  =  01:22 AM  
H:mm  =  1:22  
h:mm tt  =  1:22 AM  
HH:mm:ss  =  01:22:45

EDIT: Since now we know the time is a double change the code to (assuming you want hours and minutes):

// This will handle over 24 hours
TimeSpan ts= System.TimeSpan.FromHours(Time);
string.Format("{0}:{1}", System.Math.Truncate(ts.TotalHours).ToString(), ts.Minutes.ToString());

// Keep in mind this could be bad if you go over 24 hours
DateTime.MinValue.AddHours(Time).ToString("H:mm");

Related Solutions

C# – Calculate relative time in C#

Jeff, your code is nice but could be clearer with constants (as suggested in Code Complete).

const int SECOND = 1;
const int MINUTE = 60 * SECOND;
const int HOUR = 60 * MINUTE;
const int DAY = 24 * HOUR;
const int MONTH = 30 * DAY;

var ts = new TimeSpan(DateTime.UtcNow.Ticks - yourDate.Ticks);
double delta = Math.Abs(ts.TotalSeconds);

if (delta < 1 * MINUTE)
  return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago";

if (delta < 2 * MINUTE)
  return "a minute ago";

if (delta < 45 * MINUTE)
  return ts.Minutes + " minutes ago";

if (delta < 90 * MINUTE)
  return "an hour ago";

if (delta < 24 * HOUR)
  return ts.Hours + " hours ago";

if (delta < 48 * HOUR)
  return "yesterday";

if (delta < 30 * DAY)
  return ts.Days + " days ago";

if (delta < 12 * MONTH)
{
  int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30));
  return months <= 1 ? "one month ago" : months + " months ago";
}
else
{
  int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365));
  return years <= 1 ? "one year ago" : years + " years ago";
}

C# – the difference between String and string in C#

string is an alias in C# for System.String.
So technically, there is no difference. It's like int vs. System.Int32.

As far as guidelines, it's generally recommended to use string any time you're referring to an object.

e.g.

string place = "world";

Likewise, I think it's generally recommended to use String if you need to refer specifically to the class.

e.g.

string greet = String.Format("Hello {0}!", place);

This is the style that Microsoft tends to use in their examples.

It appears that the guidance in this area may have changed, as StyleCop now enforces the use of the C# specific aliases.

Best Answer

Related Solutions

C# – Calculate relative time in C#

C# – the difference between String and string in C#

This is the style that Microsoft tends to use in their examples.

Related Topic