[belajar-access] menghitung jam

Dear all..
perkenalkan saya anggota baru..mau nanya nih mengenai perhitungan jam dan tanggal
kasusnya begini:

Contoh kasus
tgl check in	jam check in	tgl check out	jam check out	hari
10/15/2011	7:00:10	10/16/2011	7:00:10	1	day
10/16/2011	7:00:10	10/18/2011	7:00:10	2	day
10/17/2011	7:00:10	10/18/2011	7:00:10	1	day
10/18/2011	7:00:10	10/19/2011	7:00:10	1	day
10/19/2011	7:00:10	10/20/2011	7:00:10	1	day
10/20/2011	7:00:10	10/21/2011	7:00:10	1	day
10/21/2011	7:00:10	10/22/2011	18:00:00	2	day

Mohon bantuan nya gimana cara melakukan perhitungan tersebut dan tersimpan kedalam database.terima kasih

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