[GitHub] [incubator-iotdb] jixuan1989 commented on issue #1276: 你好,请问现在iotdb的时间是精确到毫秒级吗 (What is the time precision unit of IoTDB? Can it be changed?)

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jixuan1989 commented on issue #1276:
URL: https://github.com/apache/incubator-iotdb/issues/1276#issuecomment-634542829


   IoTDB默认使用毫秒， 但是其实IoTDB内部是用的long进行存储的，因此可以通过配置来支持微秒和纳秒。
   在IoTDB配置文件(iotdb-engine.properties)中的如下配置:
   ```
   # Use this value to set timestamp precision as "ms", "us" or "ns".
   # Once the precision is been set, it can not be changed.
   timestamp_precision=ms
   ```
   这样的话，你传入一个long时间戳，就会将其按照微秒或者纳秒解读了。
   不过目前的版本中 `now()`返回的是毫秒值， 所以如果将`timestamp_precision`设置为`us`或者`ns`，那么时间将来解析成人类可读的时间(yyyy-mm-dd HH:MM:ss)就会不太对。 这个会马上加PR修复。
   
   By default, IoTDB considers a long timestamp as millisecond time unit, but you can change it in iotdb-engine.properties: `timestamp_precision=us` or `timestamp_precision=ns`.
   
   But currently, `now()` function only returns `ms`.
   
   
   
   


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