A cronjob based approach would be the best way, store the values in variables and change the variable with code executed by a cronjob, I found a quite extensive thread on Stackoverflow
Stackoverflow
To summarise it I quote one of the Threads in case it gets closed
[shortened quote] The script will only run if you have a cron-job or someone access the page. (and a cron job is basically the computer accessing the page at a specific time!)
If you want a variable dependant on time of day simply use a if statement
(pseudo code)
if(now() < $time){
$var = 1;
}else{
$var = 2;
}
This means that anyone who visits the page before $time gets $var1 and after gets $var2
You will also find an introduction to cronjobs here
Cron Jobs
The big question is if you are familiar with cron jobs and if your hosting environment allows them.
I hope this will put you on the right track!
Cheers
Johannes
