Birthday Reminder Tool
Track birthdays; auto-sorts contacts by days until next birthday and age turning.
Written by Golam Rabbani, Founder & Lead Engineer
How to use this birthday reminder tool
- Enter a contact's name in the "Name" field, pick their date of birth, and optionally add a note.
- Press Add to save that contact to the list; repeat for every person you want to track.
- Edit any row's name, date of birth, or notes directly in the table; use the up/down arrows to reorder manually.
- Press "Sort by upcoming" to rank all contacts by how many days remain until each person's next birthday.
- Read the results panel — amber-highlighted rows have birthdays within 7 days — then press Copy to save the list to your clipboard.
About this birthday reminder tool
The birthday reminder tool keeps a personal contact list and tells you, in days, how long until each person's next birthday and which age they will be turning.
For each contact the tool computes the next calendar occurrence of their birth month and day. If that date has already passed this year, the calculation advances to the following year. Days until the next birthday are counted as whole days from today's midnight. The age turning is simply the next-birthday year minus the birth year. When you press "Sort by upcoming", all contacts are re-ordered from fewest days to most, and any contact with 7 or fewer days remaining is highlighted in amber so it stands out at a glance.
Worked example (from 2026-05-28): Mum born 1965-06-02 has her next birthday on 2 Jun 2026 — 5 days away, turning 61, highlighted in amber. Dad born 1962-11-12 has 168 days to go, turning 64. Sister born 1990-03-14 already celebrated this year, so her next birthday is 14 Mar 2027 — 290 days away, turning 37. Sorted order: Mum, Dad, Sister.
Your contact list is stored only in your browser's localStorage under the key "toolnest:birthday-reminder-tool", so it persists across page reloads without sending any data to a server. The tool is useful for anyone who wants a lightweight, no-signup way to stay on top of friends' and family members' birthdays.
FAQ
- What does the birthday reminder tool do?
- It stores a list of contacts with their dates of birth, calculates how many days remain until each person's next birthday and which age they will be turning, and sorts the list from soonest to furthest. Contacts within 7 days are highlighted in amber.
- Does the tool send reminders or notifications?
- No. The tool does not send emails, push notifications, or alerts of any kind. To use it as a reminder, bookmark the page and revisit it whenever you want to check upcoming birthdays.
- Can I import contacts from my phone or address book?
- No. Contacts must be added manually, one at a time, using the Name, Date of birth, and Notes fields. There is no file import or address-book integration.
- How does the tool handle a February 29 (leap-day) birthday?
- The tool schedules the next birthday on Feb 29 in the next available leap year. In non-leap years, the JavaScript Date constructor rolls Feb 29 forward to Mar 1, so those contacts will show a Mar 1 next birthday in non-leap years.
- Where is my contact data stored?
- Only in your browser's localStorage on this device. Nothing is sent to a server. Clearing site data, switching browsers, or using a private/incognito window will remove the stored contacts.
- Is the birthday reminder tool free to use?
- Yes. The tool is completely free and requires no account or sign-up.