How do I best update a datetime variable from two separate time/date edit boxes?

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I have two boxes that look like the link below:

dateEdit_NightShiftEndDate and timeEdit_NightShiftEndTime[^]

I populate these boxes with a variable called NightShiftEndDateTime. I'd like to edit this variable to the value set in the boxes when they are changed.

What I have tried:

C#

DateTime NightShiftEndDateTimeToUse = dateEdit_NightShiftEndDate.DateTime.AddHours(-(dateEdit_NightShiftEndDate.DateTime.TimeOfDay.Hours)).AddMinutes(-(dateEdit_NightShiftEndDate.DateTime.TimeOfDay.Minutes));

DateTime NightShiftEndDateTimeToUse2 = NightShiftEndDateTimeToUse.AddHours(timeEdit_NightShiftEndTime.Time.Hour).AddMinutes(timeEdit_NightShiftEndTime.Time.Minute);

NightShiftEndDateTime = NightShiftEndDateTimeToUse2;

This works correctly but it seems like a very long winded way to do something simple. Any advice on how to do this efficiently would be appreciated.

Posted 24-May-22 3:11am

Will Sewell

Updated 24-May-22 5:28am

PIEBALDconsult

v2

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OriginalGriff · Accepted Answer · 2022-05-24T03:29:00

Convert one to a Timespan, and then add it on to the original DateTime:

C#

DateTime start = DateTime.Now.Date;
DateTime end = new DateTime (1970, 1, 1, 8, 30, 0); // Midnight is a good starter.
    // 8 hours, thirty minutes
    // Any year, month, day will do as long as it's a valid DateTime
TimeSpan hoursAndMinutes = end - end.Date;
DateTime endOfShift = start + hoursAndMinutes;
Console.WriteLine($"{start} - {endOfShift}");