fix nanosecond computation
fix nanosecond computation

when less/more than nine digits

Change-Id: I222ae7c51e37468a01abc9caab91657ea2593d13

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core