Cuckoo report is generated in JSON file. Interpretation of json value interpretation

After the analysis is done of Malware the following sample part is generated in the JSON file.

"calls": [ { "category": "system", "status": 0, "stacktrace": [], "last_error": 0, "nt_status": -1073741515, "api": "LdrLoadDll", "return_value": 3221225781, "arguments": { "basename": "atp", "module_address": "0x00000000", "flags": 0, "module_name": "atp.dll", "stack_pivoted": 0 }, "time": 1584287582.774751, "tid": 2396, "flags": {

}

},

what is "time": 1584287582.774751" in this json file.