feat: add possibility to get time from Point (#419)

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## 6.6.0 [unreleased]
 
+### Features
+1. [#419](https://github.com/influxdata/influxdb-client-java/pull/419): Add possibility to get time from `Point` data structure
+
 ### Documentation
 1. [#406](https://github.com/influxdata/influxdb-client-java/pull/406): Fix compatibility of the `doclint` between JDK 8 and JDK 18
 

client/src/main/java/com/influxdb/client/write/Point.java

@@ -253,6 +253,14 @@ public Point time(@Nullable final Long time, @Nonnull final WritePrecision preci
         return time((Number) time, precision);
     }
 
+    /**
+     * @return the data point timestamp
+     */
+    @Nullable
+    public Number getTime() {
+        return time;
+    }
+
     /**
      * @return the data point precision
      */

client/src/test/java/com/influxdb/client/write/PointTest.java

@@ -293,6 +293,19 @@ void timeInstantNull() {
         Assertions.assertThat(point.toLineProtocol()).isEqualTo("h2o,location=europe level=2i");
     }
 
+    @Test
+    void timeGetTime() {
+
+        Instant time = Instant.parse("2022-06-12T10:26:03.800123456Z");
+
+        Point point = Point.measurement("h2o")
+                .addTag("location", "europe")
+                .addField("level", 2)
+                .time(time, WritePrecision.NS);
+
+        Assertions.assertThat(point.getTime()).isEqualTo(BigInteger.valueOf(1655029563800123456L));
+    }
+
     @Test
     void defaultTags() {