I have a spreadsheet with data like this:
Date Meal Calories
1/11/16 Breakfast 260
1/11/16 Lunch 270
1/11/16 Dinner 406.3
1/11/16 Snacks 1320
1/12/16 Breakfast 270
1/12/16 Lunch 330
1/12/16 Dinner 421.2
1/12/16 Snacks 1500
(and on)

I would like create a table that shows (i.e. totaling up each day):
Date TotalCalories
1/11/16 2,256.3
1/12/16 2,521.2
(and on)

Then, I would like another total that can take the daily totals and total them by week, so I would get something like:
Week Beginning Total Calories
1/8/16 15,152.5
1/15/16 15,264.1
1/22/16 14,654.2
(and on)

Any help on how I can do this would be appreciated!

Thanks!