If you want to provide the ability to record the date, the time, or both in a form, add a date/time field to the form. The value in a date/time field can be formatted and displayed according to predefined patterns and according to the locale specified for the field.
Livecycle datetimefields task.41.2.1 Overview of date/time fields  
After you add a date/time field to the form design, you can edit the caption text and manipulate the object’s properties in the Field, Value, and Binding tabs of the Object palette. You can define these properties:
Specify that LiveCycle Designer ES use the horizontal length of the text field to determine the maximum number of characters and numbers to allow.
Date/time fields support scripting and calculations. If a user is to supply data, you can define whether the input is recommended or required, and you can set up messages to prompt users appropriately. All user input may be validated through scripting.
See also 

Overview of date/time fields