Hi Mark I found this algo
https://web.archive.org/web/20170507133619/https://alcor.concordia.ca/~gpkatch/gdate-algorithm.html It should be enough with our new math functions. As an experiment I made the first part (the g function): \define g(y, m, d) <$set name=m value={{{ [[$m$]add[9]remainder[12]] }}}> <$set name=y value={{{ [<m>divide[10]subtract[$y$]negate[]] }}}> <$set name=y4 value={{{ [<y>add[4]] }}}> <$set name=y100 value={{{ [<y>divide[100]] }}}> <$set name=y400 value={{{ [<y>divide[400]] }}}> <$set name=m3 value={{{ [<m>multiply[306]add[5]divide[10]] }}}> {{{ [[365]multiply<y>add<y4>subtract<y100>add<y400>add<m3>add[$d$]subtract[1]] }}} </$set></$set></$set></$set></$set></$set> \end This seems to work but it is only half of what is needed so I can't tell for sure. What you're asking for is d(g(y,m,d) + n) which thus requires the d function and maybe also to mess a bit with the <<now>> macro to extract the desired bits. Or maybe it could be integrated into the function for a more elegant solution. Tell me if you need more help and I'll fiddle a bit more. I'm a bit heavy on work for some time but I'm a tiddly junkie so small and well defined bits like these... <:-) -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/a381b8e5-842d-4ffc-923c-401310d11f79%40googlegroups.com.
