SQL Query Date Range

Below I have Multiple Queries to return counts per group under different where clauses.

Where dtCallDate between @datecol-30 and @datecol needs to search for records between 30 to 59 days old. But if I add -59 to the second property then the entire Statement returns 0 rows

Also if any of the SELECTS return nothing then they all will return 0


Declare @WeekNum int = 15

DECLARE @datecol datetime = GETDATE();
DECLARE @YearNum char(4);
SELECT @YearNum = CAST(DATEPART(YY, @datecol) AS CHAR(4));

      SET NOCOUNT ON;


    -- Insert statements for procedure here
With Qry1 as (
SELECT     tGroups.sGroupName,  count(*) row_cnt
FROM         tEnquiry INNER JOIN
                      tCustomers ON tEnquiry.iCustomerID = tCustomers.ID INNER JOIN
                      tGroups ON tCustomers.iGroupID = tGroups.ID
Where dtCallDate between dbo.GetWeekFirst(@WeekNum - 4, @YearNum) AND dbo.GetWeekLast(@WeekNum, @YearNum)
Group by  tGroups.sGroupName),
Qry2 as (
SELECT     tGroups.sGroupName, count(*) row_cnt2
FROM         tEnquiry INNER JOIN
                      tCustomers ON tEnquiry.iCustomerID = tCustomers.ID INNER JOIN
                      tGroups ON tCustomers.iGroupID = tGroups.ID
Where iStatus in (0, 1)
Group by  tGroups.sGroupName),
Qry3 as (
SELECT     tGroups.sGroupName, count(*) row_cnt3
FROM         tEnquiry INNER JOIN
                      tCustomers ON tEnquiry.iCustomerID = tCustomers.ID INNER JOIN
                      tGroups ON tCustomers.iGroupID = tGroups.ID
Where dtCallDate between @datecol-30 and @datecol
Group by  tGroups.sGroupName),
Qry4 as (
SELECT     tGroups.sGroupName, count(*) row_cnt4
FROM         tEnquiry INNER JOIN
                      tCustomers ON tEnquiry.iCustomerID = tCustomers.ID INNER JOIN
                      tGroups ON tCustomers.iGroupID = tGroups.ID
Where dtCallDate between @datecol-60 and @datecol
Group by  tGroups.sGroupName),
Qry5 as (
SELECT     tGroups.sGroupName, count(*) row_cnt5
FROM         tEnquiry INNER JOIN
                      tCustomers ON tEnquiry.iCustomerID = tCustomers.ID INNER JOIN
                      tGroups ON tCustomers.iGroupID = tGroups.ID
Where dtCallDate between @datecol-90 and @datecol
Group by  tGroups.sGroupName),
Qry6 as (
SELECT     tGroups.sGroupName, count(*) row_cnt6
FROM         tEnquiry INNER JOIN
                      tCustomers ON tEnquiry.iCustomerID = tCustomers.ID INNER JOIN
                      tGroups ON tCustomers.iGroupID = tGroups.ID
Where iStatus in (2) AND dtEnquiryCompleted between dbo.GetWeekFirst(@WeekNum - 4, @YearNum) AND dbo.GetWeekLast(@WeekNum, @YearNum)
Group by  tGroups.sGroupName)
Select
Qry1.sGroupName , Qry1.Row_Cnt as 'NewJobs', row_cnt2 as 'TotalOutstanding', row_cnt3 as '30Days', row_cnt4 as '60Days', row_cnt5 as '90Days',
row_cnt6 as 'JobsCompleted'
From Qry1
Join Qry2 on Qry1.sGroupName = Qry2.sGroupName
Join Qry3 on Qry1.sGroupName = Qry3.sGroupName
Join Qry4 on Qry1.sGroupName = Qry4.sGroupName
Join Qry5 on Qry1.sGroupName = Qry5.sGroupName
Join Qry6 on Qry1.sGroupName = qry6.sGroupName