Bulk upload of staff list

Whenever i try to do a bulk upload of staff using the excel template, everything else uploads except the date birthdate, date joined and effective date. What can i do? i have tried severally and also followed the format indicated on the excel template but i am still not getting the desired result

  1. Use the sample data in the template to test
  2. Take note of your date format entry, not the displayed date format, these are 2 different things