请教各位高手! EAD Renew! 填表 part 11 问题

part 11. 问 Have you ever before applied for employment authorization from USCIS? Dates?

(1) For Dates? Do I need to fill out the EAD approved period (09/12/2007-09/011/2008) or the date of filing my EAD application (04/30/2007).

谢谢各位大侠。