diff --git a/src/cli-date.ts b/src/cli-date.ts
index 66831b9..4b58ed4 100644
--- a/src/cli-date.ts
+++ b/src/cli-date.ts
@@ -12,7 +12,11 @@ function parseLocalDate(s: string): Date {
     throw new Error(`Invalid date format "${s}": expected YYYY-MM-DD`)
   }
   const [y, m, d] = s.split('-').map(Number) as [number, number, number]
-  return new Date(y, m - 1, d)
+  const parsed = new Date(y, m - 1, d)
+  if (parsed.getFullYear() !== y || parsed.getMonth() !== m - 1 || parsed.getDate() !== d) {
+    throw new Error(`Invalid date "${s}": month or day out of range`)
+  }
+  return parsed
 }
 
 export function parseDateRangeFlags(from: string | undefined, to: string | undefined): DateRange | null {
diff --git a/tests/date-range-filter.test.ts b/tests/date-range-filter.test.ts
index c4f9408..b4c1ddb 100644
--- a/tests/date-range-filter.test.ts
+++ b/tests/date-range-filter.test.ts
@@ -48,6 +48,16 @@ describe('parseDateRangeFlags', () => {
       .toThrow('Invalid date format')
   })
 
+  it('throws on month out of range', () => {
+    expect(() => parseDateRangeFlags('2026-13-01', undefined))
+      .toThrow('month or day out of range')
+  })
+
+  it('throws on day out of range for month', () => {
+    expect(() => parseDateRangeFlags('2026-02-30', undefined))
+      .toThrow('month or day out of range')
+  })
+
   it('same day is valid (start midnight, end 23:59:59)', () => {
     const range = parseDateRangeFlags('2026-04-10', '2026-04-10')
     expect(range).not.toBeNull()