Try this:
declare @Hashthis nvarchar(2000)
SELECT @Hashthis=HASHBYTES ('SHA1',CAST(54 AS varchar)+CAST(1 AS varchar)
+CAST('2013-07-26 16:30:49.9786317' AS varchar)+CAST(1 AS varchar))
SELECT 'Worked' where HASHBYTES ('SHA1',CAST(54 AS varchar)+CAST(1 AS varchar)
+CAST('2013-07-26 16:30:49.9786317' AS varchar)+CAST(1 AS varchar))=@Hashthis