Ryzom API

every minute is overkill.

take a snapshot from server time every half hour or so and advance it manually. each RL second adds 10 to tick i think (it's morning, so might be wrong)

... but for you problem,
this maybe ? http://msdn.microsoft.com/en-us/library/system.net.cache.aspx
or you could just append random url parameter for each request

thanks, It never came to me that I could advance it manualy :D but then of course Id have to calculate everything, and Im not sure how exact that would be, as Im messageing the user at certain times it should be fairly exact :( anyone know how long it takes for a game houer to go by?

http://atys.ryzom.com/projects/puben/wiki/L_Time

Thanks

It is said to be 72 minutes for an in game day to go by which is already an approximation... good enough if you get new tick every half hour (irl). That approximation is base on this one : 1 ig second = 0,05 irl second, so 20 ig seconds = 1 ig second.
This is fairly close to reality since I we found with some calculations an average of 19.55 ig seconds for 1 irl. So with 3600 seconds an hour, you have about 184.1(...) real seconds an hour. Roughly 3 minutes. (3*24 = 72, and nimetu's link says 72 minutes for a day indeed)

If you're interested in all this and read french, I can only invite you to have a look at this code I wrote some time ago for an atysian time PHP library : http://lucjaulmes.free.fr/dates.php and all the discussions on that topic (french official forums) : http://forums.ryzom.com/showthread.php?t=33763
If you don't get french, try something like google translate. If you still can't make sense of any of it... I could sum up & translate part of it.