每当用户选择日期时，如何在DateTimePicker中设置默认小时？

Question

I have two DateTimePickers, one named FechaEntrada and the other one FechaSalida .

I want to set FechaEntrada.Value to "whatever_date_the_user_picked 00:00:00" and FechaSalida.Value to "whatever_date_the_user_picked 23:59:59" every time the user chooses a date.

I need to compare both values from the dtpickers so I can fill a DatagridView from a DataBase with the values selected between these two dates.

In my windows form, the user CAN'T choose the hour, just the date. How can I do this? It seems simple but I can't find a solution anywhere.

Answer 1

Make it so the user sees/chooses only a date:

FechaEntrada.Format = DateTimePickerFormat.Custom;
FechaEntrada.CustomFormat = "yyyy-MM-dd"; //or whatever date you want
FechaSalida.Format = DateTimePickerFormat.Custom;
FechaSalida.CustomFormat = "yyyy-MM-dd"; //or whatever date you want

When you want to get the dates:

FechaEntrada.Value.Date; //"whatever_date_the_user_picked 00:00:00"
FechaSalida.Value.Date.AddDays(1).AddSeconds(-1); //"whatever_date_the_user_picked 23:59:59".

DateTimePicker.Value returns a DateTime

Calling DateTime.Date gives the date as at midnight 00:00:00 (it's still a datetime) - https://docs.microsoft.com/en-us/dotnet/api/system.datetime.date?view=netframework-4.8

Calling AddDays(1) and AddSeconds(-1) will scroll the date forward one day and back one seconds so:

01-Jan-2000 12:34:56
01-Jan-2000 00:00:00 //.Date
02-Jan-2000 00:00:00 //.AddDays(1)
01-Jan-2000 23:59:59 //.AddSeconds(-1)

That's how the time changes for the salida..