LeiRui commented on a change in pull request #462: [IOTDB-253]time expression
URL: https://github.com/apache/incubator-iotdb/pull/462#discussion_r336828734
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File path: docs/Documentation-CHN/UserGuide/2-Concept Key Concepts and
Terminology/1-Key Concepts and Terminology.md
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@@ -166,6 +170,42 @@ IoTDB在显示时间戳时可以支持LONG类型以及DATETIME-DISPLAY类型，
</center>
+* 相对时间戳
+
+ 相对时间是指与服务器时间```now()```和```DATETIME```类型时间相差一定时间间隔的时间。
+ 形式化定义为：
+ ```
+ Duration = (Digit+ ('Y'|'MO'|'W'|'D'|'H'|'M'|'S'|'MS'|'US'|'NS'))+
+ RelativeTime = (now() | DATETIME) ((+|-) Duration)+
Review comment:
I looked at the realization and the realization seems to also allow
`Duration ((+|-) Duration)+`. What do you think?
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