The "date start" field contains a date with multiple related uses. It can range from a rigorous start time used in worked planning, to a reminder of when attention to an item should resume.
The display of this field in the item display or update page may include an estimate of the latest possible start date, when enough information is supplied for time estimates to be made.
The Starts field can be used to express the start date as a duration.
When specifying this field in a customized sort or display, any of the names "date_start", "Date Start" or "Start Date" can be used.