Assuming all the tables have a ModifiedDate date column, you can then use the undocumented sp_msforeachtable
proc
sp_msforeachtable 'select ''?'',count(*)
from ? where ModifiedDate > ''20100101'''
Just adjust the date range, I also use count(*) because I doubt you want millions of rows returned to you
If you don't have a column then you are out of luck, or if the column is named differently in every table then you need to use dynamic sql together with information_schema.columns
and information_schema.tables
to construct this query