First Tuesday of the Month

Here is a formula date field which will calculate what the first Tuesday of the month is.  You can then compare it to your own date field to see if it matches. you will need to provide a date for [My Date field] or if you meant the first Tuesday of the current month, then you can use Today() there. 

There are probably ways to do this with a shorter formula but this has the advantage of being stupid simple and could be adjusted easily for a different first day of the month.



var date FirstOfTheMonth = FirstDayOfMonth([My Date field]);

Case(DayOfWeek($FirstOfTheMonth),
0, $FirstOfTheMonth + Days(2),
1, $FirstOfTheMonth + Days(1),
2, $FirstOfTheMonth + Days(0),
3, $FirstOfTheMonth + Days(6),
4, $FirstOfTheMonth + Days(5),
5, $FirstOfTheMonth + Days(4),
6, $FirstOfTheMonth + Days(3))