Question 947592
 
Day of the Week ={{{ ((year_ordinal - 1) + (week_ordinal(1/1) - 1))}}}  modulo {{{7 + 1}}}


 If January {{{1}}}, {{{1901}}} is Tuesday (day of week {{{3}}}) , then starting at {{{2}}} ( day of week-1= {{{3-1=2}}}) you count forward {{{0}}}((day number-1={{{1- 1=0}}}) units January 1 (day number {{{1}}}) ,{{{1951}}}

so, you  arrive at {{{2}}}, second day of the week which is {{{Monday}}} 

check the calendar and see if January {{{1}}},{{{1951}}} is Monday