I need dates instead of week numbers

Well 51 of the 52 week dates are trivial because they are just X weeks after Week 1 date.

What is the definition of the date for Week 1?  It's probably something like the first Sunday of the year or the first Monday of the year.

Week 1 is the week ending with the first Saturday of the year.

Can you tell me the date you want to see for week 1 for 2019 and 2020 so I understand?

2019 would be 1/5/2019, 2020 would be 1/4/2020

The formula for the first Saturday of the Year would be

var date TodaysDate= Today(); // done this way so you can try with different dates

var date FirstSaturdayOfYearRaw = FirstDayOfWeek(FirstDayOfYear($TodaysDate))-Days(1);

If(Year($FirstSaturdayOfYearRaw) <> Year($TodaysDate), $FirstSaturdayOfYearRaw+Weeks(1), $FirstSaturdayOfYearRaw)

The formula for the various dates for each week would be a separate field with the formula 

[First Saturday of the Year] + Weeks([week number]-1)

Thank you Mark! That helps. Now I'm trying to figure out how I can show dates instead of the W1,W2... field names in reports.  Week numbers don't mean anything to the managers who will use the app.

What is the data in the cells and what are your rows?  I had that exact same problem and was able to come up with a cheat to get the dates to show.  Are the rows your people (resources)? 

Yes, the rows are people.  The data in the fields are either the capacity hours, or demand hours.

What are the columns headings now?  Are they just the week numbers?  is this a summary report type?

If so than you can just make a new field to use as Columns.

List(" ",
PadLeft(totext(week number]),2,"0"),
ToText(Week of Saturday))

The column headings now are week numbers.  I used summary fields in a table report, because I need to be able to color code when we have deficits.  I couldn't figure out how to do that in a summary report.