The control accepts arrow keys to navigate the fields in the control and change values. The control recognizes the following as valid input. The DTP control automatically updates internal information based on the user's input. The user can select an hour (from 1 to 24) by typing, by using the arrow keys, or by using the up-down control. The third control shows how arbitrary text can be added to the control. The day of the week can be changed by selecting a date from the calendar that opens when the user clicks on the down arrow. As with the first control, the user can change the time fields by typing or by using arrow keys. The second control shows a custom format set by using DateTime_SetFormat. The user can type a valid value in any of these fields, or select the field and change the value by using the up-down control or arrow keys. The first control has been created with the DTS_TIMEFORMAT style and shows the time in the default time, which consists of four fields. The following illustration shows a windows with three controls that contain the time. In the third control, the user has clicked the down arrow to display the calendar. The first date-picker control was created with the DTS_SHOWNONE style, the second with the DTS_UPDOWN style, and the third with no special styles. The following illustration shows a window that contains three date-picker controls. When it is checked, the value in the control can be retrieved otherwise, the control is considered to be uninitialized. Optionally, the control displays a check box.
The date can be selected from a calendar, or by using an up-down control the time can be changed by typing in fields that are defined by the control's Format Strings.
The client area of a date and time picker (DTP) control displays date or time information, or both, and acts as the interface through which users modify the information.
It will not calculate dates that are consistent with the Julian calendar. The control is based on the Gregorian calendar, which was introduced in 1753. Windows does not support dates prior to 1601.
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