diff --git a/pulsar-cli-utils/src/main/java/org/apache/pulsar/cli/converters/RelativeTimeUtil.java b/pulsar-cli-utils/src/main/java/org/apache/pulsar/cli/converters/RelativeTimeUtil.java
index 412a6415e3c31..aa6b8e0762865 100644
--- a/pulsar-cli-utils/src/main/java/org/apache/pulsar/cli/converters/RelativeTimeUtil.java
+++ b/pulsar-cli-utils/src/main/java/org/apache/pulsar/cli/converters/RelativeTimeUtil.java
@@ -69,8 +69,7 @@ public static long parseRelativeTimeInSeconds(String relativeTime) {
      * @return seconds
      */
     public static double nsToSeconds(long ns) {
-        double seconds = (double) ns / 1_000_000_000;
-        BigDecimal bd = new BigDecimal(seconds);
+        BigDecimal bd = BigDecimal.valueOf(ns, 9);
         return bd.setScale(3, RoundingMode.HALF_UP).doubleValue();
     }
 }
diff --git a/pulsar-cli-utils/src/test/java/org/apache/pulsar/cli/converters/TimeConversionTest.java b/pulsar-cli-utils/src/test/java/org/apache/pulsar/cli/converters/TimeConversionTest.java
index 2091d2d5f3ae5..0b1b948276b7a 100644
--- a/pulsar-cli-utils/src/test/java/org/apache/pulsar/cli/converters/TimeConversionTest.java
+++ b/pulsar-cli-utils/src/test/java/org/apache/pulsar/cli/converters/TimeConversionTest.java
@@ -86,6 +86,7 @@ public void testFailingParsing() {
     public void testNsToSeconds() {
         assertEquals(RelativeTimeUtil.nsToSeconds(1_000_000_000), 1.000);
         assertEquals(RelativeTimeUtil.nsToSeconds(1_500_000_000), 1.500);
+        assertEquals(RelativeTimeUtil.nsToSeconds(1_234_500_000), 1.235);
         assertEquals(RelativeTimeUtil.nsToSeconds(1_555_555_555), 1.556);
     }
 }
diff --git a/pulsar-common/src/main/java/org/apache/pulsar/common/util/RelativeTimeUtil.java b/pulsar-common/src/main/java/org/apache/pulsar/common/util/RelativeTimeUtil.java
index 12dd6efd6c0b2..2b7e74a85ff36 100644
--- a/pulsar-common/src/main/java/org/apache/pulsar/common/util/RelativeTimeUtil.java
+++ b/pulsar-common/src/main/java/org/apache/pulsar/common/util/RelativeTimeUtil.java
@@ -72,8 +72,7 @@ public static long parseRelativeTimeInSeconds(String relativeTime) {
      * @return seconds
      */
     public static double nsToSeconds(long ns) {
-        double seconds = (double) ns / 1_000_000_000;
-        BigDecimal bd = new BigDecimal(seconds);
+        BigDecimal bd = BigDecimal.valueOf(ns, 9);
         return bd.setScale(3, RoundingMode.HALF_UP).doubleValue();
     }
 }
diff --git a/pulsar-common/src/test/java/org/apache/pulsar/common/util/RelativeTimeUtilTest.java b/pulsar-common/src/test/java/org/apache/pulsar/common/util/RelativeTimeUtilTest.java
index f27c25726dad7..b1457cc789075 100644
--- a/pulsar-common/src/test/java/org/apache/pulsar/common/util/RelativeTimeUtilTest.java
+++ b/pulsar-common/src/test/java/org/apache/pulsar/common/util/RelativeTimeUtilTest.java
@@ -58,4 +58,12 @@ public void testParseRelativeTime() {
             // expected
         }
     }
+
+    @Test
+    public void testNsToSeconds() {
+        assertEquals(RelativeTimeUtil.nsToSeconds(1_000_000_000), 1.000);
+        assertEquals(RelativeTimeUtil.nsToSeconds(1_500_000_000), 1.500);
+        assertEquals(RelativeTimeUtil.nsToSeconds(1_234_500_000), 1.235);
+        assertEquals(RelativeTimeUtil.nsToSeconds(1_555_555_555), 1.556);
+    }
 }