sql server - SQL Case statement returns wrong value -

i have following sql statement designed give field t1.dwposteddatekey value if t2.inventorystatuscode changes 'p'. starting value of t1.dwposteddatekey null, , if t2.inventorystatuscode doesn't change, want stay null.

select t1.datekey, t1.dwposteddatekey, (case when t2.inventorystatuscode = 'p'               , (t1.inventorystatuskey != t2.inventorystatuskey)       convert(int, getdate(), 112) else       t1.dwposteddatekey end) table1 t1 inner join    table2 t2 on t1.key = t2.key 

the problem don't null ? here example of results:

datekey     dwposteddatekey   (no column name) 20150413    null              42106 20150413    null              42106 20150413    null              42106 20150413    20150414          20150414 20150413    20150414          20150414 20150413    20150414          20150414 

what 42106 doing in there? want remain null value.

the problem line convert(int, getdate(), 112), in int.

it converting datetime int , sql server when returning number of days since 1/1/1900. (that number see)

this return need
convert(varchar, getdate(), 112)

if need integer try this
cast(convert(varchar, getdate(), 112) integer)

hope helps