Sorting to do items, Automatically inserts the date, Default option of no date in the “due date” field – Samsung SPH-I330 User Manual

Page 138: Displays a calendar to select the desired date, Select the desired date option, Displays the list using priority then due date, Displays the list using due date then priority, Displays the list using category then priority, Displays the list using category then due date, Tap “ok” to exit