= iif(Fields!sec.Value > 86400, ((Fields!sec.Value - (Fields!sec.Value mod 86400))/ 86400).ToString() & ":", "")
+ Right("00" + (((Fields!sec.Value mod 86400) - (Fields!sec.Value mod 3600)) / 3600).ToString(), 2) + ":"
+ Right("00" + (((Fields!sec.Value mod 3600)-(Fields!sec.Value mod 60)) / 60).ToString(), 2) + ":"
+ Right("00" + (Fields!sec.Value mod 60).ToString(), 2)