sum for trailing 365 days for users

Database

sum for trailing 365 days for users

Hi 

I'm trying to find the sum of amount for an 'ID' trailing 365 days from the 'DT'. Below is a sample from the data I'm working on. The below table consists of dates when purchase was made , id and the amount. I wanted to calculate amount spent by an id trailing 365 days from the 'DT'. Any help on this will be appreciated. Thanks.

DT ID AMT
1/17/15 1 31.74
1/23/15 1 14.33
1/25/15 1 21.76
3/5/15 1 150
6/12/15 1 60
4/23/16 1 16.86
4/25/16 1 60
7/1/16 1 15.57
2/26/15 2 61.9
3/1/15 2 15
2/28/16 2 25

I want my output to be 

DT ID AMT 
1/17/15 1 31.74 31.74
1/23/15 1 14.33 46.07
1/25/15 1 21.76 67.83
3/5/15 1 150 217.83
6/12/15 1 60 277.83
4/23/16 1 16.86 76.86
4/25/16 1 60 136.86
7/1/16 1 15.57 92.43
2/26/15 2 61.9 61.9
3/1/15 2 15 76.9
2/28/16 2 25 40