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Formatting TimeSpan to hours, minutes and seconds

i am trying to find a solution for my issue, i am using TimeSpan to get the total amount of time a window was open by subtracting two Datetime objects. it is working but i am getting milliseconds and i only need hours, minutes and seconds to display. this is the code i am working with _timeStart is initialize outside the method but its just gets the time the window opened.
_timeStop = DateTime.Now;
TimeSpan timeSpent = _timeStop.Subtract(_timeStart);
string.Format($"{timeSpent:hh\\:mm\\:ss}");
_logger.Debug(timeSpent);

To display just hours/minutes/seconds use this format string:
var timeSpent = new TimeSpan(1, 12, 23, 62);
Console.WriteLine(timeSpent.ToString(#"hh\:mm\:ss"));
You can find more info here

var str = string.Format("{0:00}:{1:00}:{2:00}", timeSpent.Hours, timeSpent.Minutes, timeSpent.Seconds);
_logger.Debug(str);
should do the trick

C# TimeSpan calculating hours

I am trying to create a time card solution in C# and having an issue with totaling hours worked for a week. From a drop down, the user would select the number of hours they worked in a day (ex. 5:30 - the 5:30 is the total hours worked, not the actual time 5:30). The user would select the hours each work day and the application would then total the hours for the week. The application I have written totals the hours, but I have two issues: if I use .Hours to add the hours up, I run into an issue when the total goes over 24; when I use .TotalHours, it calculates over 24 ok, but somehow it adds an hour randomly when I select :30 increments. Here is the code I have to calculate and display the totals:
using .Hours does not allow the total number of hours to go over 24. Instead it converts the 24 to 1 day and starts the adding the hours again, losing the original 24:
lblWorkgroupOneTotalTime.Text = (totalWeekOneHours.Hours).ToString("00") +
":" + (totalWeekOneHours.Minutes).ToString("00");
//using .TotalHours causes the calculation to randomly add an hour to the total:
lblWorkgroupTwoTotalTime.Text =
(totalWeekTwoHours.TotalHours).ToString("00").TrimStart('0') +
":" + (totalWeekTwoHours.Minutes).ToString("00");
I feel like I am very close to having everything work correctly, but I can't figure this part out.

How about this:
Initialize an example for 30 hours and 30 minutes:
TimeSpan totalWeekThreeHours = new TimeSpan(30, 30, 0);
(Timespan works better than DateTime here I feel.)
Then:
var hours = (int)totalWeekThreeHours.TotalMinutes / 60;
var mins = totalWeekThreeHours.TotalMinutes % 60;
Output:
var example1 = hours + ":" + mins;
var example2 = String.Format("{0} hours {1} mins", hours, mins);
Console.WriteLine("Example 1: " + example1);
Console.WriteLine("Example 2: " + example2);
//Output:
//Example 1: 30:30
//Example2: 30 hours 30 minutes

it adds an hour randomly
Nothing in programming happens "randomly". So when debugging, your first step should always be to look for patterns in your bug. As long as you believe the bug happens "randomly", you will have a mental block getting in the way of finding the bug.
As for your specific issue…
For any of the Total... properties of TimeSpan, this will be a double value that represents the entire time span in the units you're retrieving, including any fractional amounts.
For example, if the TimeSpan value represents 1 hour and 45 minutes, the TotalHours value will be 1.75. At the same time, you are telling the ToString() method that you want the value rounded to the nearest integer value. So, any time that the fractional part of your time span in hours is greater than one-half, the value is rounded up to the next hour value.
If you don't want that behavior, you should just truncate the value yourself before formatting it as a string:
lblWorkgroupTwoTotalTime.Text = string.Format("{0:0}:{1:00}",
(int)totalWeekTwoHours.TotalHours, totalWeekTwoHours.Minutes);
I also don't see why you used the format string "00" only to strip off the leading 0 after the fact. Easier to just not format the string that way in the first place.
Finally, note alternative syntax for formatting strings. Your approach (calling ToString() explicitly) is fine, but I find it wordy. The above is more concise, and does a better job separating the format from the input values.

The problem with displaying TotalHours with a format string of "00" is that it's going to round up. You have a couple of choices if you don't want to show days:
Use Hours + Days * 24 for the hours
Use TotalMinutes / 60 for hours
Convert TotalHours to an int, which will always round down
For example:
var totalHours = (totalWeekOneHours.Days * 24) + totalWeekOneHours.Hours;
// Or:
var totalHours = totalWeekOneHours.TotalMinutes / 60;
// Or:
var totalHours = (int)totalWeekOneHours.TotalHours;
Then you can output it:
lblWorkgroupOneTotalTime.Text = $"{totalHours:00}:{totalWeekOneHours.Minutes:00}";

Minute give wrong values on substract

I want to subtract minutes and get the difference. below is my code
double diff = currBlock.EndTime.Subtract(currBlock.StartTime).TotalMinutes;
In given code (currBlock.StartTime = 23:30:00) and (currBlock.EndTime= 00:20:00)
here starttime is time of today i.e.(09/26/2016 23:30:00), night time which will be consider as 11:30 PM and endtime is time of tomorrow i.e.(09/27/2016 00:20:00), morning time which will be consider as 12:20 Am. In my code i am getting values in minus which is -1390 and it is incorrect. So please help me to solve this.
Here i have attach image of data for further reference.

please explain me properly, how do i use it? it is just a time block for different shift so there is no date include in it
There is a date included in it. You're telling us that EndTime is something like 09/27/2016 00:20:00, while StartTime is something like 09/26/2016 23:30:00. The problem is that that knowledge is in your head and not in your code. If you subtract the values as TimeSpans, then you're literally saying: what is 30 minutes minus 23 hours and 30 minutes. The answer, of course is -23 hours. To get the real difference, you must include the dates, which means utilizing a DateTime or DateTimeOffset type for both StartTime and EndTime, so you can encode that whole date and time. Then, when you do the subtraction, it will return the right value.

Below Code works for me. Thanks friends for your support and help.
string strCurrDate = (DateTime.Now.Date + currBlock.EndTime).ToString();
DateTime dtYourDate = DateTime.Parse((DateTime.Now.AddDays(-1).Date + currBlock.StartTime).ToString());
string strYourDate = dtYourDate.ToShortDateString() + " " + dtYourDate.ToLongTimeString();
string strTotalMinsElapsed = TotalMinutesElapsed(dtYourDate).ToString();
private long TotalMinutesElapsed(DateTime dtYourDate)
{
long lTotalMinutesElapsed = 0;
//Find Current Date and Time
DateTime dtCurrent = DateTime.Now;
//Find Time Difference details between current date and your given date
TimeSpan tsDiff = dtCurrent.Subtract(dtYourDate);
//Add Total Minutes for Days difference
lTotalMinutesElapsed = lTotalMinutesElapsed + tsDiff.Days * (24 * 60);
//Add Total Minutes for Hour difference
lTotalMinutesElapsed = lTotalMinutesElapsed + tsDiff.Hours * 60;
//Add Minutes
lTotalMinutesElapsed = lTotalMinutesElapsed + tsDiff.Minutes;
return lTotalMinutesElapsed;
}

Time Math Guidance needed

I have a DateTime object that is 10:00 AM
This time represents what time of day a report should be run.
I want to calculate the amount of time remaining from NOW until 10:00 AM
part of my confusion is NOW might be after 10:am or BEFORE 10am,
I keep playing around with TimeSpan, but my results are not quite right... I am sure this is simple, but it is one of those things I have been working of for a few hours and I need a push in the right direction...
I want the timespan object timeTillRun to be correct...here is what I have tried:
{
DateTime scheduledRun = DateTime.Today.AddHours(_timeToStart);//_timeToStart = 10
TimeSpan timeTillRun = DateTime.Now - scheduledRun;
}

This will work... but you need to reverse the order of subtraction:
TimeSpan timeTillRun = scheduledRun - DateTime.Now;
Note that if it's currently after 10AM, timeTillRun will be negative. You will presumably also need to check if the current time is on or after 10AM, then add 10 hours and one day to DateTime.Today to obtain the next run time. Alternatively, you could test if timeTillRun is negative; if so, just add one day to it (timeTillRun += new TimeSpan(1, 0, 0, 0)).

Try this
DateTime timeToStart = DateTime.Today.AddHours(10);
TimeSpan timeTillRun;
// Checking to see if current time is passed schedule run, if it is then we add a day (this is assuming this is run daily, if days are skipped like weekends for example then this would need some tweaking)
if (DateTime.Now > timeToStart)
timeTillRun = DateTime.Now.AddDays(1.0) - timeToStart;
else
timeTillRun = DateTime.Today - timeToStart;
double totalHoursRemaining = timeTillRun.TotalHours; // get total hours remaining
string prettyRemaining = String.Format("{0} day and {1} hours", timeTillRun.Days, timeTillRun.Hours); // can do some outputting here

Parsing times above 24 hours in C#

Suppose a time stamp (just time or date and time) where the time can roll over to the next day:
00:00:00 <- midnight
01:00:00 <- 1 AM
23:00:00 <- 11 PM
24:00:00 <- midnight, day + 1
25:00:00 <- 1 AM, day + 1
What would be a way to parse it easily into a C# DateTime that would perform the carry-over to the next day? In other words, "01:00:00" would become "0001-01-01 01:00:00" and "25:00:00" would become "0001-01-02 01:00:00".
EDIT:
I should mention that this fails miserably (i.e FormatException):
DateTime.ParseExact("0001-01-01 25:00:00", "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);

Since you're trying to represent a period of time from an arbitrary point, rather than as a specific date, perhaps you would be better off using the System.TimeSpan class? This allows you to set values of more than 24 hours in the constructor, and can be used with DateTime objects like this:
System.TimeSpan timestamp = new System.TimeSpan(25, 0, 0);
System.DateTime parsedDateTime = new DateTime(0, 0, 0);
parsedDateTime = parsedDateTime.Add(timestamp);
Console.WriteLine(parsedDateTime.ToString("yyyy-MM-dd HH:mm:ss")); //Output as "0001-01-02 01:00:00"
NOTE: Code is untested.
EDIT: In terms of parsing the strings, I can't think of any basic .NET objects that parse strings with values greater than 23 for the hour (since 25 is an invalid hour of the day), but assuming that the format is consistent, you could create a very simple string parsing routine (or even a regular expression) to read the values individually, and load the constructor manually.

If you have an existing DateTime value you can add to, you can always use a TimeSpan:
string dt = "25:00:00";
int hours = int.Parse(dt.Split(':')[0]);
TimeSpan ts = TimeSpan.FromHours(hours);
TimeSpan.Parse() doesn't work directly in this case because it complains (fair enough!) about the 25 in the hour notation.

If you want to code it out... this should be a starting point:
string dateString = "0001-01-01 25:00:00";
string[] parts = dateString.Split(' '); //now have '0001-01-01' and '25:00:00'
string datePart = parts[0]; // '0001-01-01'
string[] timeParts = parts[1].Split(':'); //now have '25', '00', and '00
DateTime initialDate = DateTime.ParseExact(datePart, "yyyy-MM-dd", CultureInfo.InvariantCulture);//use the date as a starting point
//use the add methods to get your desired datetime
int hours = int.Parse(timeParts[0]);
int minutes = int.Parse(timeParts[1]);
int seconds = int.Parse(timeParts[2]);
DateTime resultDate = initialDate.AddHours(hours)
.AddMinutes(minutes)
.AddSeconds(seconds);
Of course, it makes assumptions that the input is formatted properly and is parsable, etc..
In addition, you could definitely use timespan instead of the individual add methods for hour, minute, second as some other answers are..

In case nobody points out an out-of-the-box answer, here is a neat ActionScript class I wrote to parse time inputs (human input)...
https://github.com/appcove/AppStruct/blob/master/Flex/AppStruct/src/AppStruct/TimeInput.as
It would be very simple to port this to C#, and you could tweak the 24 hour logic to result in #days, #hours, #minutes.
Good luck!

You are specifying an invalid date. So not only can you not parse it, you cannot store it!
How about a nice TimeSpan object instead? (It also has a Parse() method.)
Alternatively, use a sscanf()-type function like the one at http://www.blackbeltcoder.com/Articles/strings/a-sscanf-replacement-for-net to extract each number separate. (Best if you have no control over the string format being read.)