Update 4.date-and-time.md (#981)

docs-2.0/3.ngql-guide/3.data-types/4.date-and-time.md

@@ -12,16 +12,20 @@ While inserting time-type property values, except for `TIMESTAMP`, Nebula Graph
 
 - `date()`, `time()`, and `datetime()` all accept the property name to return a specific property value of itself. For example, `date().month` returns the current month, while `time("02:59:40").minute` returns the minutes of the importing time.
 
+- `date()`, `time()`, and `datetime()` can transform a time-type property with a specified time zone. For example, `datetime("2017-03-04 22:30:40.003000+08:00")` or `datetime("2017-03-04T22:30:40.003000[Asia/Shanghai]")`.
+
 ## OpenCypher Compatibility
 
 In nGQL:
 
-- Year, month, day, hour, minute, and second are supported, while the millisecond is not supported.
+- Year, month, day, hour, minute, second, millisecond, and microsecond are supported, while the nanosecond is not supported.
 
 - `localdatetime()` and `duration()` are not supported.
 
 - Most string time formats are not supported. The exceptions are `YYYY-MM-DDThh:mm:ss` and `YYYY-MM-DD hh:mm:ss`.
 
+- The single-digit string time format is supported. For example, `time("1:1:1")`.
+
 ## DATE
 
 The `DATE` type is used for values with a date part but no time part. Nebula Graph retrieves and displays `DATE` values in the `YYYY-MM-DD` format. The supported range is `-32768-01-01` to `32767-12-31`.
@@ -84,7 +88,7 @@ The `TIMESTAMP` data type is used for values that contain both date and time par
 2. Insert a vertex named `test1`.
 
  ```ngql
- nebula> INSERT VERTEX date1(p1, p2, p3) VALUES "test1":(date("2021-03-17"), time("17:53:59"), datetime("2021-03-17T17:53:59"));
+ nebula> INSERT VERTEX date1(p1, p2, p3) VALUES "test1":(date("2021-03-17"), time("17:53:59"), datetime("2017-03-04T22:30:40.003000[Asia/Shanghai]"));
  ```
 
 3. Return the content of the property `p1` on `test1`.