FOSS gamedev and creative worlds

I am experimenting with mesecons and ran into a problem: For example, I want to make a mesecon creation that sets time to day only when it is dusk. How do I find the current time or hp with a command block or lua controller?

use=solarpanel-notgate-cmdblock

for full-time day(only works when chunk loaded) other than that i cant help

thanks for the help, now for the hp problem...