Use date of first student activity as startDate
Use date of first student activity as startDate

icodegame/codecombat,icodegame/codecombat,jeremiahyan/codecombat,codecombat/codecombat,javatlacati/codecombat,icodegame/codecombat,fabichoi/codecombat,codecombat/codecombat,codecombat/codecombat,Zerrien/codecombat,jeremiahyan/codecombat,Zerrien/codecombat,javatlacati/codecombat,fabichoi/codecombat,kidaa/codecombat,jeremiahyan/codecombat,fabichoi/codecombat,javatlacati/codecombat,Zerrien/codecombat,kidaa/codecombat,codecombat/codecombat,jeremiahyan/codecombat,javatlacati/codecombat,kidaa/codecombat,codecombat/codecombat,fabichoi/codecombat,javatlacati/codecombat,Zerrien/codecombat,icodegame/codecombat,kidaa/codecombat