Windows Live Photo Gallery ignores ContentCreateDate and creates one more ContentCreateDate in the matadata if I adjust date/time. I also tried to write the below listed tags into the file's metadata but "Media created" and "Date taken" fields are still empty. Please let me know what tag does WLPG read from the metadata and how do I reset it if there is one stored already in the database. 

MediaCreateDate
MediaModifyDate
QuickTime:CreateDate
QuickTime:ModifyDate
TrackCreateDate
TrackModifyDate
FileCreateDate
FileModifyDate

DateTimeDigitized

CreateDate

DateTime

DateTimeOriginal

ModifyDate
ContentCreateDate
EncodingTime