Always use proper units when saving.

Always use proper units when saving.

When we see a number like 23.145, we'd better always also see a unit.
It's just good practice.  So add 'min' to duration (and use only two
digits for number of seconds), and 'm' to depth.

And write the date in international standard format.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>