diff --git a/cmd/site/internal/date.go b/cmd/site/internal/date.go
index cc81a1c..960cdc2 100644
--- a/cmd/site/internal/date.go
+++ b/cmd/site/internal/date.go
@@ -2,7 +2,7 @@ package internal
 
 import "time"
 
-const iOS13DetriFormat = `2006 M01 2`
+const iOS13DetriFormat = `2006 M1 2`
 
 // IOS13Detri formats a datestamp like iOS 13 does with the Lojban locale.
 func IOS13Detri(t time.Time) string {
diff --git a/cmd/site/internal/date_test.go b/cmd/site/internal/date_test.go
new file mode 100644
index 0000000..60254f9
--- /dev/null
+++ b/cmd/site/internal/date_test.go
@@ -0,0 +1,28 @@
+package internal
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func TestIOS13Detri(t *testing.T) {
+	cases := []struct {
+		in  time.Time
+		out string
+	}{
+		{
+			in:  time.Date(2019, time.March, 30, 0, 0, 0, 0, time.FixedZone("UTC", 0)),
+			out: "2019 M3 30",
+		},
+	}
+
+	for _, cs := range cases {
+		t.Run(fmt.Sprintf("%s -> %s", cs.in.Format(time.RFC3339), cs.out), func(t *testing.T) {
+			result := IOS13Detri(cs.in)
+			if result != cs.out {
+				t.Fatalf("wanted: %s, got: %s", cs.out, result)
+			}
+		})
+	}
+}