Use NSDateFormatter for now while we consider threading issues with ISO8601 date formatter
Use NSDateFormatter for now while we consider threading issues with ISO8601 date formatter

k131050059/sstoolkit,sideci-sample/sideci-sample-sstoolkit,zjh171/sstoolkit,rtsbtx/sstoolkit,soffes/sstoolkit,cobook/sstoolkit,lijie121210/sstoolkit,TDness/sstoolkit,Amnysia/SSToolkit,Amnysia/SSToolkit,samsoffes/sstoolkit,samsoffes/sstoolkit,carabina/sstoolkit,andaluz/sstoolkit,SuPair/sstoolkit,zilaiyedaren/sstoolkit