Merge pull request #16319 from Michaelin007/proto

Convert Google Protocol Buffer Timestamp to LocalDate

Author: Maiklins

protobuffer/src/main/java/com/baeldung/protobuftimestamptolocaldate/TimestampInstance.java

@@ -0,0 +1,21 @@
+package com.baeldung.protobuftimestamptolocaldate;
+
+import com.google.protobuf.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.Instant;
+
+public class TimestampInstance {
+
+    private static final Logger logger = LoggerFactory.getLogger(TimestampInstance.class);
+
+    public static void main(String[] args) {
+        Instant currentTimestamp = Instant.now();
+        Timestamp timestamp = Timestamp.newBuilder()
+            .setSeconds(currentTimestamp.getEpochSecond())
+            .setNanos(currentTimestamp.getNano())
+            .build();
+        logger.info(timestamp.toString());
+    }
+}

protobuffer/src/main/java/com/baeldung/protobuftimestamptolocaldate/TimestampToLocalDate.java

@@ -0,0 +1,19 @@
+package com.baeldung.protobuftimestamptolocaldate;
+
+import com.google.protobuf.Timestamp;
+
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.ZoneId;
+
+public class TimestampToLocalDate {
+
+    public static LocalDate convertToLocalDate(Timestamp timestamp) {
+        Instant instant = Instant.ofEpochSecond(timestamp.getSeconds(), timestamp.getNanos());
+        LocalDate time = instant.atZone(ZoneId.of("America/Montreal"))
+            .toLocalDate();
+        return time;
+
+    }
+
+}

protobuffer/src/test/java/com/baeldung/protobuftimestamptolocaldate/TimestampToLocalDateUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.protobuftimestamptolocaldate;
+
+import com.google.protobuf.Timestamp;
+import org.junit.Test;
+
+import java.time.LocalDate;
+
+import static org.junit.Assert.assertEquals;
+
+public class TimestampToLocalDateUnitTest {
+
+    @Test
+    public void givenTimestamp_whenConvertedToLocalDate_thenSuccess() {
+        Timestamp timestamp = Timestamp.newBuilder()
+            .setSeconds(1000000000)
+            .setNanos(778866000)
+            .build();
+        LocalDate time = TimestampToLocalDate.convertToLocalDate(timestamp);
+        assertEquals(LocalDate.of(2001, 9, 8), time);
+    }
+
+}