Why not let the computer do it, instead of having to do it by eyeball?
It is not fun to look at numbers like 1503910660.06171 and
1503910665.5169 and try to see whether their difference is larger than
that of 1503910824.20391 and 1503910828.43125.

Change-Id: If20882e97959e65b8518b66c4ae965e1b3cc3b51