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C# turn Datepicker value to Datetime?

How do i turn a Datepicker to Datetime or vice versa
void Submit()
{
TimeSpan Days = Date-DateTime.Now;
CountdownScreen resultpage = new CountdownScreen(Subject.Text, Date.Text);
NavigationService.Navigate(resultpage);
}
this is the code ive been attempting to work with to get the days from Date (the variable from datepicker) and the current date to get the difference in days
With help of Rufus L the new code looks like
TimeSpan duration = Date.SelectedDate.GetValueOrDefault() - DateTime.Now;
//+1 to add the extra day as it seems to round down days
int days = duration.Days + 1;

A DatePicker control has a .SelectedDate property that represents the selected DateTime value:
TimeSpan duration = datePicker.SelectedDate.GetValueOrDefault() - DateTime.Now;
Or, to get the difference in days:
// TotalDays is a double, since there's a time component, it could be something like 1.25
var days = (datePicker.SelectedDate.GetValueOrDefault() - DateTime.Now).TotalDays;

Calculating the Number of Days between two Dates and displaying it in a Label

Hi I'm trying to capture two dates selected by the user in a C# Calendar Control and I want the date range to be displayed in a label. I have worked out on the following code but it generates a Minus value ; not the actual date range.
DateTime from = CalFrom.SelectedDate;
DateTime to = CalTo.SelectedDate;
double days = (CalTo.SelectedDate - CalFrom.SelectedDate).TotalDays;
TimeSpan t = to - from;
double noOfDays = t.TotalDays;
TimeSpan ts = to - from;
double differnceindays = ts.TotalDays;
lblNoofDays.Text = differnceindays.ToString();

This code is working perfectly for me for calculating the number the days between two days.
DateTime d1 = DateTime.Now;
DateTime d2 = DateTime.Now.AddDays(10);
TimeSpan difference = d2 - d1;
var days = difference.TotalDays;

DateTime.Now.Subtract(startDate).Days.ToString();

try to calculate no of days between two dates
string days = (date2 - date1).Value.Days.ToString();

The only problem I see is that you assume the start and end dates will be correctly range checked, meaning start date is never greater than end date (which would produce negative values for total days). If you want to correct for the fact that start date may be after end date, then this should work.
DateTime startDate = DateTime.Now.AddDays(-94); // Example random 94 day span..
DateTime endDate = DateTime.Now;
TimeSpan duration = endDate > startDate ? endDate - startDate : startDate - endDate;
double daysBetweenDates = duration.TotalDays;
Note: "daysBetweenDates" will include fractional days (thus the double type). Also, the code above assumes local time. If you want UTC you will need to account for that.

Can I find total time of 1st time and 2nd time in DATETIME?

I would like to find total time of 2 DATETIME. Now I have 2 DATETIMES: loginDT and logoutDT. For loginDT I get from Database and logoutDT is now. like this code below
DateTime loginDT = (DateTime)readerS["login_Date_Time"];
DateTime logoutDT = DateTime.Now;
DateTime total = ??????????????
How should I do?
Thanks All

Time intervals in C# are measured with TimeSpan structure. You can get it simply by substracting two DateTime variables:
DateTime loginDT = (DateTime)readerS["login_Date_Time"];
DateTime logoutDT = DateTime.Now;
TimeSpan total = logoutDT - loginDT;

DateTime loginDT = (DateTime)readerS["login_Date_Time"];
DateTime logoutDT = DateTime.Now;
TimeSpan difference = loginDT.Subtract(logoutDT);

It seems, that you want something like that:
DateTime loginDT = (DateTime)readerS["login_Date_Time"];
DateTime logoutDT = DateTime.Now;
//TODO: have look at TotalHours, TotalSeconds, TotalMilliseconds
// Difference in Days;
// store this value as a Number field of the RDBMS table
Double totalDays = (logoutDT - loginDT).TotalDays;

How to set current time to a value

I was just wondering if there is a way to get the current time and set it into a value.
If its 12:06 AM.. I want to get that time and set it into currentTime.
Example
float currentTime = 0;
currentTime = 12.06;

As others have mentioned, the DateTime class would be ideal for this, and to work out the difference between 2 date/times:
DateTime end = DateTime.Now;
DateTime start = new DateTime(2011, 12, 5, 12, 6,0);
double hours = (end - start).TotalHours;
The subtraction of DateTime objects results in a TimeSpan object that you can use to see the hours/minutes etc.

try DateTime class
DateTime dt = DateTime.Now;

Is this what you're looking for?
DateTime currentTime;
currentTime = DateTime.Now;

Don't use floats or strings. You can do all kinds of cool things using DateTime.
Here's how you'd get the hours that someone worked:
var clockIn = new DateTime(2011,12,4,9,0,0); // December 4th, 9 AM
var clockOut = new DateTime(2011,12,4,17,0,0); // December 4th, 5 PM
var duration = clockOut - clockIn; // TimeSpan
Console.Write(duration.TotalHours); // 8

A few people have mentioned how, but as a 'better' recommendation you should use
DateTime currentTime = DateTime.UtcNow
Otherwise you have issues when the clocks go back, if your timing code is run on those days. (plus it is far easier to alter the UTC time to local time than it is to convert a '1am' to UTC (as there will be two of them when the clocks go back)

Well if you really what it as a float then try:
var currentDate = DateTime.Now;
float currentTime = float.Parse((currentDate.Hour > 12 ? currentDate.Hour -12 :
currentDate.Hour) + "." + currentDate.Minute);
I wouldn't recommend comparing dates or time with floats. A better options would be to use timespans.

You should be using a Timespan instance for time related values, you can use the flexibility to get the required values like
TimeSpan ts = DateTime.Now.TimeOfDay;
ts.ToString("hh:mm") // this could be what you are looking for
You could then use ts.TotalHours which would give you fractional hours (as a double) else you could construct a string specifically using ts.Hours ..ts.Minutes play around and it could be prove useful.

Try the following:
DateTime StartTime=StartTime value;
DateTime CurrentTime=DateTime.Now;
TimeSpan dt = CurrentTime.Subtract(StartTime);
In dt you will get a working time period.

If you want to have the difference between two times, then do this:
DateTime dateOne = DateTime.Parse(enteredTime);
DateTime dateTwo = DateTime.Now;
TimeSpan difference = dateOne - dateTwo;

Time span calculation for hours and minutes in C#

The final result should display the user the time span between the start hour and the end hour.(e.g. start work at 06:30 AM and finished at 18:30 PM, the result to display should be 12 hours).
Now, I have to DateTime parameters; fromTime and toTime
Each DateTime parameter have an hour in 24 hour format, and also might have a minutes value of 30 min.
What I willing to do is to get the time span between those DateTime parameters.
For the hours I used this method:
Public TimeSpan GetHourSpan(DateTime fromTime, DateTime toTime)
{
TimeSpan fromH = TimeSpan.FromHours(fromTime.Hour);
TimeSpan toH = TimeSpan.FromHours(toTime.Hour);
TimeSpan hourTotalSpan = toH.Subtract(fromH);
return hourTotalSpan;
}
This is great, my problem is to get the time span in minutes if there is, and finally add it to the TimeSpan object to display.
If both have 30 min time span in the above way will return 0, and than I have to start check every parameter if it have a value in the min property.
Isn't there an easy way to get time span for hours and min together?

TimeSpan span = toTime - fromTime;
// Split into hours:minutes: span.Hours, span.Minutes
// Total span in hours: span.TotalHours
// Total span in minutes (hours * 60): span.TotalMinutes

If you deduct a DateTime from a DateTime, the result is a a TimeSpan. So you can simply take
TimeSpan result = toTime-fromTime;
int hours = result.Hours;
int minutes = result.Minutes;

TimeSpan span = toTime - fromTime;

public double DurationinMins(DateTime startDt, DateTime endDt)
{
var ts = endDt.Subtract(startDt);
return ts.TotalMinutes;
}