[mplaisier]

I ran into a similar problem on a Raspberry Pi, where my program would ignore data because it was deemed too old. It turns out a Pi uses fake-hwclock. This tool stores a timestamp regularly in a file. On boot the Pi reads from that file to set the time. When the Pi has been turned off for longer then the initial time can be hours or days out of sync. The Pi then takes a couple of seconds to obtain a valid time via NTP, but my program ran quickly enough to work with the old timestamp. After a couple of minutes it would typically work again.