Template:ISO week demo

[expression " ((((({{{1}}})*12+({{{2}}})+57608.5 round 0)/12-1.5 round 0)*1461/4-0.5 round 0) -(((({{{1}}})*12+({{{2}}})+57608.5 round 0)/12-1.5 round 0)/100-0.5 round 0) +(((({{{1}}})*12+({{{2}}})+57608.5 round 0)/12-1.5 round 0)/400-0.5 round 0) +(((({{{2}}})+57608.5 round 0)mod 12+4)*153/5-0.5 round 0) +({{{3}}})-32167 )mod7+1" in DOW gives system message ""]