Hi,
Day lenght difference between days aren't included in templates as Cumulus have only
one webtag for that and it is "not recommended" by Cumulus, as stated in the wiki:
<#tomorrowdaylength>
A string giving an approximate predicted difference between the length of daylight today and tomorrow. This web tag is unreliable, and its use is not recommended. Its use is therefore not supported (i.e. you use it at your own risk).
So, a reliable script has to be developped to adress this enhancements.
you could add it to "Wish list" (in forum menu) and if others agree something
would be done.
Regards,
Jacques