The dates help you track how long each job takes and how well you are able
to estimate the length of a job. When you create a customer:job list report,
you can add columns that show the start date, your projected end date, and the
actual end date for each job.
When a date changes: If one of the dates for a job changes
(for example, you revise your projected end date for the job), you must edit
the job record and change the date yourself. QuickBooks cannot change the date
Edit or change job information