diff --git a/cmd/metrics.go b/cmd/metrics.go
index 90fe7c2e..df419333 100644
--- a/cmd/metrics.go
+++ b/cmd/metrics.go
@@ -533,13 +533,13 @@ func runMetricsQuery(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	// Parse time ranges
-	from, err := util.ParseTimeParam(fromTime)
+	// Parse time ranges as second-aligned millisecond timestamps
+	fromMs, err := util.ParseTimeToUnixMilli(fromTime)
 	if err != nil {
 		return fmt.Errorf("invalid --from time: %w", err)
 	}
 
-	to, err := util.ParseTimeParam(toTime)
+	toMs, err := util.ParseTimeToUnixMilli(toTime)
 	if err != nil {
 		return fmt.Errorf("invalid --to time: %w", err)
 	}
@@ -560,8 +560,8 @@ func runMetricsQuery(cmd *cobra.Command, args []string) error {
 						Name:       datadog.PtrString("a"),
 					},
 				}},
-				From: from.UTC().UnixMilli(),
-				To:   to.UTC().UnixMilli(),
+				From: fromMs,
+				To:   toMs,
 			},
 			Type: datadogV2.TIMESERIESFORMULAREQUESTTYPE_TIMESERIES_REQUEST,
 		},
@@ -572,11 +572,11 @@ func runMetricsQuery(cmd *cobra.Command, args []string) error {
 		if r != nil {
 			apiBody := extractAPIErrorBody(err)
 			if apiBody != "" {
-				return fmt.Errorf("failed to query metrics: %w\nStatus: %d\nAPI Response: %s\n\nRequest Details:\n- Query: %s\n- From: %s (Unix: %d)\n- To: %s (Unix: %d)\n\nTroubleshooting:\n- Verify your query syntax is correct (e.g., avg:metric.name{filter})\n- Check that the time range is valid\n- Ensure the metric exists and has data in the specified time range\n- Confirm you have proper permissions to access the metric",
+				return fmt.Errorf("failed to query metrics: %w\nStatus: %d\nAPI Response: %s\n\nRequest Details:\n- Query: %s\n- From: %d\n- To: %d\n\nTroubleshooting:\n- Verify your query syntax is correct (e.g., avg:metric.name{filter})\n- Check that the time range is valid\n- Ensure the metric exists and has data in the specified time range\n- Confirm you have proper permissions to access the metric",
 					err, r.StatusCode, apiBody,
 					queryString,
-					from.Format(time.RFC3339), from.Unix(),
-					to.Format(time.RFC3339), to.Unix())
+					fromMs,
+					toMs)
 			}
 			return fmt.Errorf("failed to query metrics: %w (status: %d)", err, r.StatusCode)
 		}
diff --git a/cmd/metrics_test.go b/cmd/metrics_test.go
index 28e2cf53..d182e5e5 100644
--- a/cmd/metrics_test.go
+++ b/cmd/metrics_test.go
@@ -824,3 +824,79 @@ func TestParseTimeParam_NowKeyword(t *testing.T) {
 		t.Errorf("util.ParseTimeParam(\"now\") = %v, too far from current time %v (diff: %v)", result, now, diff)
 	}
 }
+
+// TestV2TimeseriesTimestampConversion verifies that ParseTimeToUnixMilli
+// produces second-aligned millisecond timestamps suitable for Datadog APIs.
+func TestV2TimeseriesTimestampConversion(t *testing.T) {
+	tests := []struct {
+		name    string
+		timeStr string
+	}{
+		{"now keyword", "now"},
+		{"relative 1 hour", "1h"},
+		{"relative 30 minutes", "30m"},
+		{"relative 7 days", "7d"},
+		{"unix timestamp", "1700000000"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			msTimestamp, err := util.ParseTimeToUnixMilli(tt.timeStr)
+			if err != nil {
+				t.Fatalf("ParseTimeToUnixMilli(%q) unexpected error: %v", tt.timeStr, err)
+			}
+
+			if msTimestamp <= 0 {
+				t.Errorf("expected positive millisecond timestamp, got %d", msTimestamp)
+			}
+
+			// Must be on a second boundary (divisible by 1000)
+			if msTimestamp%1000 != 0 {
+				t.Errorf("timestamp %d is not on a second boundary (remainder: %d)", msTimestamp, msTimestamp%1000)
+			}
+
+			// Verify round-trip: converting back should produce a valid second
+			roundTripped := time.Unix(msTimestamp/1000, 0)
+			if roundTripped.Unix() != msTimestamp/1000 {
+				t.Errorf("round-trip failed: expected Unix=%d, got Unix=%d",
+					msTimestamp/1000, roundTripped.Unix())
+			}
+		})
+	}
+}
+
+// TestV2TimestampUnixMilliVsUnixTimes1000 demonstrates the difference between
+// UnixMilli() and Unix()*1000 when a time.Time has sub-second precision.
+// parseTimeParam("now") calls time.Now() which includes nanosecond precision,
+// and relative times are computed via time.Duration arithmetic that also
+// preserves nanosecond precision.
+func TestV2TimestampUnixMilliVsUnixTimes1000(t *testing.T) {
+	// Construct a time with known sub-second precision
+	// 2024-01-15 12:00:00.123456789 UTC
+	ts := time.Date(2024, 1, 15, 12, 0, 0, 123456789, time.UTC)
+
+	unixMilli := ts.UnixMilli()       // Includes millisecond component: ...123
+	unixTimes1000 := ts.Unix() * 1000 // Truncated to second boundary: ...000
+
+	// UnixMilli includes the sub-second milliseconds
+	if unixMilli%1000 == 0 {
+		t.Error("expected UnixMilli() to have sub-second component for a time with nanoseconds")
+	}
+
+	// Unix()*1000 is always on a second boundary
+	if unixTimes1000%1000 != 0 {
+		t.Errorf("expected Unix()*1000 to be on second boundary, got remainder %d", unixTimes1000%1000)
+	}
+
+	// The difference should be exactly the millisecond component (123ms)
+	diff := unixMilli - unixTimes1000
+	if diff != 123 {
+		t.Errorf("expected difference of 123ms, got %d", diff)
+	}
+
+	// Both should represent approximately the same point in time
+	// (within 1 second)
+	if diff < 0 || diff >= 1000 {
+		t.Errorf("timestamps diverged by more than 1 second: diff=%dms", diff)
+	}
+}
diff --git a/pkg/util/time.go b/pkg/util/time.go
index 7b2b9d14..627191e8 100644
--- a/pkg/util/time.go
+++ b/pkg/util/time.go
@@ -89,11 +89,14 @@ func ParseTimeToUnix(timeStr string) (int64, error) {
 	return t.Unix(), nil
 }
 
-// ParseTimeToUnixMilli parses time string and returns Unix timestamp in milliseconds
+// ParseTimeToUnixMilli parses time string and returns Unix timestamp in milliseconds.
+// Uses Unix()*1000 instead of UnixMilli() to produce second-aligned timestamps.
+// time.Now() and duration arithmetic produce nanosecond precision, and UnixMilli()
+// preserves the sub-second component which some Datadog APIs reject or misinterpret.
 func ParseTimeToUnixMilli(timeStr string) (int64, error) {
 	t, err := ParseTimeParam(timeStr)
 	if err != nil {
 		return 0, err
 	}
-	return t.UnixMilli(), nil
+	return t.Unix() * 1000, nil
 }