How to get everything working when not running 24/7

I am struggling a bit at the moment with a couple of things, mainly caused by the problem of not being able to run WD 24/7, and was wondering if anyone else in this situation can help me out with the following?

  1. Average/Extremes web pages do not get created automatically at 00.05 as my PC is down.

  2. Tideprediction does not get created or uploaded automatically at 06.00 as my PC is down.

I have not found any way to alter the file creation times for either of these things, and I have not found a way to alter the auto upload time for tides. Although there are some threads which say I should be able to do tides in the advanced settings I have not found it!