Weather-driven programming ability?

A real mixed bag of sky conditions has interspersed my morning through the square windows today:  heavy, dark and brooding clouds; mid-grey, scudding low clouds; blue sky with scattered cotton wool wisps; and now, a selection of light- to dark-grey clouds, fairly high, driven by a blustery west wind.  Very few birds so far, mainly pigeons and crows.  Yesterday's kite absence made me smile as I drove out of the gates after work, and there was a low, circling kite right over the road, flashing its bright, white, underwing patches; keeping a level course with delicate twitches of its arrowhead tail.
At last, the sun makes a brief appearance from behind me, lighting the top of the distant horse chestnut, the tallest tree in my line of sight, as it thrashes in the wind like an escaplogist, wriggling his shoulders to rid himself of a straitjacket.
Anyway, as the sun lit up the treetops, I think I've worked out how to maintain retest periods and dates in my database, so I'd better apply myself to that instead.