How to weekly group a data

Question

I'm currently stuck with this problem. Suppose I have the following daily data

 

+-------------------------------+----------

|                  Date               | Total  |

+-------------------------------+----------

| 2016-08-01 00:00:00.000 | 10 |

| 2016-08-02 00:00:00.000 | 10 |

| 2016-08-03 00:00:00.000 | 20 |

| 2016-08-04 00:00:00.000 | 40 |

| 2016-08-05 00:00:00.000 | 20 |

| 2016-08-06 00:00:00.000 | 10 |

| 2016-08-07 00:00:00.000 | 50 |

| 2016-08-16 00:00:00.000 | 57 |

| 2016-08-17 00:00:00.000 | 52 |

+-------------------------+-----+----------

 

 

 

 How will I group it in such a way that it will sum Total by weekly basis? Expected output should be

 

 

2012-08-01 to 2012-08-07 = 160

2012-08-08 to 2012-08-15=0