How to save a birthday with just the month and day

For a personal birthday reminder, the month and day are enough. Use a birthday field that allows an unknown year, or keep the month and day separately in a list. If you create an ordinary calendar event, use the next celebration date and check that it repeats annually.

Avoid entering an invented birth year into a date-of-birth field. It can produce an incorrect age and make your records harder to understand later.

Keep the birthday and the age separate

You might know that Sam celebrates on August 17 without knowing how old Sam is. Save that information as it stands.

A simple birthday list can have these columns:

Leaving the last column empty means “unknown.” It does not mean zero, this year, or a year you chose just to satisfy a form.

If an app requires a birth year, look for an unknown-year option or choose a different way to store the reminder. Support for yearless dates varies. For example, Monica documents a dedicated option for saving dates without a year; that does not establish how other apps handle them. Monica’s explanation

Use a calendar event when a birthday field will not work

A calendar event needs a date on the calendar. That date can represent the upcoming celebration without claiming to be the person’s date of birth.

For example, if the next August 17 has not happened yet, an event named “Sam’s birthday” on that August 17 refers to the celebration. Configure annual repetition in your calendar if available, and inspect the next year’s occurrence before relying on it.

Do not write an age into the title unless you know it and intend to keep it accurate. “Sam turns 30” can become wrong the following year if the same wording repeats.

Take care when moving a list into another app

An import tool may interpret an incomplete date differently from your spreadsheet. Keep a copy of the original list and try a small sample first.

Check these things in the preview or imported sample:

• The month and day have not been reversed.
• An empty year has not become a fabricated age.
• The birthday appears on the expected date next year.
• A second import would not create a second copy unintentionally.

If the destination requires a year, do not assume a placeholder will stay hidden. Use the destination’s documented method for an unknown year, or keep the record in your original list until you have a suitable option.

Ask about February 29 preferences

If someone was born on February 29, ask how they like to celebrate in years without that date. You can keep February 29 as their birthday and separately note their preferred celebration day.

Calendar and reminder behavior can vary, so inspect the next non-leap-year occurrence. A preference such as February 28 or March 1 should come from the person, rather than an assumption about everyone born on leap day.

You do not have to ask their age

If the only purpose is sending a greeting, try “What month and day should I save?” That leaves the year out of the request from the beginning.

When they volunteer a year later, update the record if it is useful. Until then, a birthday can remain a date you celebrate without becoming an age you track.

For message examples, see how to ask for someone’s birthday.