RaspberryPi: Simple Time Server

Both my birdbox systems and my Portable (garden) PiCam need to know the time & date in order to properly time-stamp video clips and events.

Up until now I have relied upon an old HP Compaq D510 to help set the correct time, but I've finally got around to replacing this with a not quite so old Pi B v1 Rev1.

Although the D510 was quite economical, my Pi replacement should consume less than 5% of the power of its predecessor.

BirdBoxPiCam2014: updating Time on the RaspberryPi

Ok, so it turned out that using NTP to reset the clock on the Raspberry Pi was not one of my greatest ideas for this project.

NTP is for real computing, where high accuracy is required and small errors need to be slowly tuned out.

My requirements for this bird box project are for a step-change correction each time the system boots up, which may be several times per day. Accuracy is just not important.