I have exported data from a health app showing my weight that I tracked over the last few years. The app no longer has this functionality so the only way for me to get this data is to read the JSON file and put it into another app. I understand the weight part, as it is KG, instead of LB. I just need help understanding the "Created_at" so I know what date this is from. Is there an easier way to translate this part of the JSON? Based on the timezone offset, it looks like it is in seconds, but that's all I have figured out so far. Any help would be greatly appreciated.
{
"start_time": 1517323800000,
"created_at": 1517323824000,
"updated_at": 1517323824000,
"start_time_timezone_offset": -22000,
"weight": 73.84483783600001,
"origin_type": "manual",
"id": "d1640b9b-c8bd-6b54-5a3c-da492e8ac75a"
}