How to set a dateTimePicker value to DateTime.MaxValue

Question

This generates an error at runtime:

dateTimePicker.Value = DateTime.MaxValue;

Answer 1

You can't.

The maximum date supported by DateTimePicker is DateTimePicker.MaximumDateTime, which is 12/31/9998; DateTime.MaxValue is 12/31/9999 23:59:59, which is one year and one day later.

Can you use that DateTimePicker.MaximumDateTime instead of DateTime.MaxValue?

Answer 2

You need to use the DateTimePicker.MaximumDateTime property. The maximum value allowable for the datetime picker is 31/12/9998, as represented by DateTimePicker.MaximumDateTime. Whereas the value of DateTime.MaxValue is 31/12/9999.

Answer 3

Yes you can, but it is quite dirty (use it at your own risk). Basically, it overwrites the MaxValue defined in the DateTimePicker with the MaxValue from the DateTime object.

Paste this code into the Main (or any method run during startup):

var dtpType = typeof(DateTimePicker);
var field = dtpType.GetField("MaxDateTime", BindingFlags.Public | BindingFlags.Static);
if (field != null)
{
    field.SetValue(new DateTimePicker(), DateTime.MaxValue);
}