How can I specify the latest time of day with DateTime
.NetDatetime.Net Problem Overview
I am using a System.DateTime
object to allow a user to select a date range. The user is only able to select a date (not time) using a third party calendar so I will need to automatically specify the time of day it should use (ie: 00:00:00 or 23:59:59) after the date is chosen.
How can I specify the time after the date is already stored as a DateTime object by the calendar selector? I could use the AddHours, AddMinutes, AddSeconds
methods but those are relative to the current time which may not be 00:00:00.
The startDate
will need to have a time of 00:00:00 and endDate
have a time of 23:59:59 to account for the entire days.
.Net Solutions
Solution 1 - .Net
If you already have a DateTime
object created and want to replace the time with the 11:59:59PM for that given date, then you can use the .Date
property to get the date with time set to 00:00:00 and then add the hours, minutes and seconds. For example:
var dt = yourDateInstance.Date.AddHours(23).AddMinutes(59).AddSeconds(59);
If by latest time, you mean 11:59:59 PM, then this should also work:
var dt = new DateTime(Now.Year, Now.Month, Now.Day, 23, 59, 59);
Solution 2 - .Net
To get the last instant for today:
DateTime d = new DateTime(Now.Year, Now.Month, Now.Day);
d = d.AddDays(1);
d = d.AddTicks(-1);
In response to your edit, here's what I would do:
DateTime start = new DateTime(Now.Year, Now.Month, Now.Day);
DateTime end = start.AddDays(1).AddTicks(-1);
// Or - just use end = start.AddDays(1), and use a < for comparison
Solution 3 - .Net
DateTime d = DateTime.Today.AddDays(1).AddTicks(-1);
Solution 4 - .Net
Your question has already been answered, but IMHO a better way is not to bother attempting to subtract a tick, a second, or whatever from the end of the range, and compare using strictly less than.
So that if you want all dates in an inclusive range from startDate to endDate, ignoring the time, you could use the following in C#:
if ((myDate >= startDate.Date) && (myDate < endDate.Date.AddDays(1)))
{
// ... it's in the range
}
or in T-SQL, assuming your @StartDate and @EndDate are exactly midnight, something like:
WHERE SomeDate >= @StartDate AND SomeDate < DATEADD(d,1,@EndDate)
UPDATE
Updated example to show an inclusive range in response to comments.
Solution 5 - .Net
Based on the other answers I created this convenient extension method:
public static class DateTimeExtensions
{
public static DateTime EndOfDay(this DateTime dateTime)
{
return dateTime.Date.AddDays(1).AddTicks(-1);
}
}
Solution 6 - .Net
DateTime startDate = DateTime.Today;
DateTime stopDate = startDate.AddDays(1).AddTicks(-1);
As a note, DateTime.Today
returns (from MSDN)
> A System.DateTime set to today's date, > with the time component set to > 00:00:00.
So as others have noted, add a day, then subtract the smallest time quantum (a tick), and you get the last possible time for the current day.
Of course, you might have to think about TimeZones and such depending where the code runs versus where the user is. UTC time might be good, but that might bump you off a day (either way) depending where your code runs.
Solution 7 - .Net
Using an Extension Method
public static DateTime EndOfTheDay(this DateTime date)
{
return new DateTime(date.Year, date.Month, date.Day).AddDays(1).AddTicks(-1);
}
The result here would provide you with the latest time possible by getting the beginning of the day - add a day and then subtract one tick. Other methods add Hours, Minutes and Seconds however those solutions depending on code functions will cause issues for any time between 23:59:59.000000 and 23:59:59.999999
For example if I want to know if a value is before a certain end date / time , the possibility with other solutions is that they would miss values in the millisecond range.
Solution 8 - .Net
For example
DateTime.Now.Date.AddDays(1).AddSeconds(-1)
Or AddTicks/AddMilliseconds/AddMinutes
... based on the precision you need.
Solution 9 - .Net
Why not ToDayEnd() extension
/// <summary>
/// Gets the value of the End of the day (23:59)
/// </summary>
/// <param name="target"></param>
/// <returns></returns>
public static DateTime ToDayEnd(this DateTime target)
{
return target.Date.AddDays(1).AddMilliseconds(-1);
}
But if you would really mean the absolute end of the day then AddTicks(-1) is the answer.
Solution 10 - .Net
yourDateInstance.CloseDate = yourDateInstance.CloseDate.Date.AddDays(1).AddMilliseconds(-1);
Solution 11 - .Net
use this
DateTime YourNewDate = new DateTime(YourDate .Year, YourDate .Month, YourDate .Day, 23, 59, 59, 99);
Solution 12 - .Net
this will give you the expected result:
DateTime startDate= DateTime.Now.Date;
DateTime endDate= startDate.AddDays(2).Add(new TimeSpan(23, 59, 59));
//startDate: 28/9/2017 0:0:0 endDate: 29/9/2017 23:59:59