kameda/j2   offset 0sec
hattori/gx8 offset -167sec

			real	exif	offset
kameda	J2	7016	9:40:17	9:38:25	112sec
hattori	GX8	0001	5:44:14	5:45:11	-57sec

as a result ... 169sec ... almost ok (just 2 sec)

kameda	J2	15:14:28	 28
hattori	GX8	15:17:15	195	-167sec