The phrase "tentative date" means a suggested or proposed date that is not yet fixed or confirmed. It may still be subject to change or adjustment. Full definition
They are not totally reliable as it is unique to every women especially if you have irregular menstrual cycle.They helps you to get tentative dates of your fertility window. (momjunction.com)
The film will shoot out of L.A. with tentative dates. (backstage.com)
According to tentative dates on a web page for Northeast Collectors, the trade organization that runs Westchester's gun shows, there were dates already slated for 2018 for another gun show event, but no contract had been agreed to. (harrisonreview.com)