Filter Activity history by date range

I am writing a script for personal use that gives a summary of crucible games and I already have all the code set up to retrieve stats/desired medals but I'd like for it to show stats/medals since the weekly reset. I don't think there is a specific way to do this automatically, but is there a way to filter the response from the /Stats/ActivityHistory endpoint based on date/time? Another question, does anyone know what the medal for a Triple Down is called in the /Stats/PostGameCarnageReport/ endpoint? The Double Down medal is called medalsKillsMulti2, but I have played games with a Triple Down and haven't found a medal that represents that value. Thanks for any and all help!