Count unique records for a specific date

I have a table in a sheet and I want a formula that will count the unique records. The simplified database is as follows (in a table):

Date	Job#	Item
1-Feb	10	material
1-Feb	10	parts
1-Feb	10	labour
1-Feb	11	labour
2-Feb	12	parts
2-Feb	12	material
2-Feb	13	labour
2-Feb	14	labour

As you can see, on the 1-Feb, there are 4 records, but only 2 unique job numbers. There are 3 unique numbers on 2-Feb.

So I would like a forumula that will count the unique numbers in the job# column for a set date. I would have thought sumproduct could do it, but I haven't had any luck. I am open to any suggestion that can return an answer in a cell (ie I don't want to use a pivot table or summarise the table etc).