Days Open is calculated using the open dates of positions on the job, not the job itself, and is defined as:
the difference between the most recent hire date (or today's date, if no hires yet) and the earliest open date for positions on the job
Assume a job was posted on Feb 1st, 2017. This job has two open positions:
- Position 1 has an open date of Feb 6th, 2017.
- Position 2 has an open date of Feb 13th, 2017.
As of March 7th, 2017, no one has been hired for either position. Position 1 has the earliest open date, so:
Today's date - earliest position open date = Days open
Mar 7th - Feb 6th = 29 Days open