所有测量都带有创建测量时的时间戳（事件时间）。其中一些测量是人为的，这意味着它们不是由设备本身创建的，而是由在 CoT 内运行的 CEP 规则创建的。
The "normal" measurements have the time format coded as UTC
[{
"id": "12704547",
"data": {
"data": {
"time": "2016-07-25T15:24:11.000Z",
"id": "1152930",
"self": "http://testTenant.c8y.com/measurement/measurements/1152930",
"source": {
"id": "222812",
"self": "http://testTenant.c8y.com/inventory/managedObjects/222812"
},
"type": "tsystems_cumulocity_energymeter_digital_ping",
"Energieverbrauch": {
"Ping": {
"unit": "Wh",
"value": 1
}
}
},
"realtimeAction": "CREATE"
},
"channel": "/measurements/222812"
}, {
"successful": true,
"channel": "/meta/connect"
}]
但是“人工”测量（由 CEP 规则创建）使用带有本地时间的时间戳
[{
"id": "12704578",
"data": {
"data": {
"time": "2016-07-25T17:24:00.952+02:00",
"id": "1152931",
"self": "http://testTenant.c8y.com/measurement/measurements/1152931",
"source": {
"id": "222812",
"self": "http://testTenant.c8y.com/inventory/managedObjects/222812"
},
"type": "tsystems_cumulocity_energymeter_power_consumption",
"Leistung": {
"Aggregation_1min": {
"unit": "W",
"value": 900
}
}
},
"realtimeAction": "CREATE"
},
"channel": "/measurements/222812"
}]
来自一台设备的测量值应始终使用相同的时区（首选 UTC）进行编码，因为不同的时区可能会在使用该数据的客户端中产生问题。
我在 CEP 中创建“时间”
current_timestamp().toDate() as time