They would also be fun for wedding save the date cards! Stamp the month stamp, then stamp the date - if desired, you can also just use the month!
Bullet Journal Date Stamps, Clear Planner Stamps, Months Year Calendar Stamp Set
Icon Planner Stamp Set 54pc, Clear Stamp Set for Journals - Printed Heron
Happy Planner Recipe Stamps
Clear Stamp Set / Clear Stamps /daily Planner Junk Journal Themed Transparent Stamps Planner /journal Accessories S30
Bullet Journal Stamps Calendar
Calendar Clear Stamp Set
Bullet Journal Date Stamps, Clear Planner Stamps, Months Year Calendar Stamp Set
Weekly Clear Stamp
Monthly Planner Pad - Denmark