Age is more than a single number. People ask for exact age down to seconds, next birthday timing, and the number of working days between two dates. The SnipText Age and Birthday Calculator answers all of these with a simple interface that runs locally in your browser for privacy.
What the Age and Birthday Calculator does
- Exact age breakdown: Years, months, days, hours and seconds calculated with calendar aware math.
- Next birthday countdown: Live timer plus weekday of the birthday and how many weekends until the day.
- Date difference: Any two dates with options for calendar days or working days that exclude weekends and optional holidays.
- Leap day handling: Feb 29 birthdays default to Feb 28 in non leap years with a switch to pick March 1.
- Zodiac and planets: Western zodiac by birth date and a fun view that scales your age by planet orbital periods.
- Share and export: Copy a summary, download a JSON record, or share a read only link with prefilled dates.
Why this matters
Deadlines and milestones often depend on exact durations. Recruiters verify age thresholds, schools check cutoffs, and teams plan sprints by working days. A calculator that respects leap years and real month lengths avoids the classic 30 days per month shortcut that skews results.
Quick start
- Open the Age and Birthday Calculator.
- Enter your birth date or pick two dates in the Date Difference tab.
- Toggle Working days only to exclude weekends. Add a regional holiday list if needed (you can prepare it in the CSV Viewer & Editor).
- Copy the summary or share the prefilled link with a friend or teammate.
Educational insights beyond the tool
- Calendar aware math: Months and years are uneven. Professional calculators add months and then clamp the day to the last valid day of the target month when needed.
- Leap year rule: A year is leap if divisible by 4 except centuries not divisible by 400. The tool follows this rule for Gregorian dates.
- Working day arithmetic: Business day counts typically exclude Saturdays and Sundays. Holiday lists are region specific, so you can supply your own CSV (clean it quickly with the CSV Viewer & Editor) or toggle presets when available.
- Planet ages are illustrative: They divide your Earth age by an orbital period factor. It is for learning and fun, not legal or medical uses.
Helpful companions: plan study blocks with the Pomodoro Timer, clean pasted dates using the Whitespace and Formatting Cleaner, publish schedules with the Quick Table Generator, and visualize events with the Timeline Maker. For units in your project, try the Unit Converter. If you need to compare timezones while planning, use the Time Zone Converter.
Workflows that save time
- HR and admissions: Paste a list of birth dates, get ages and next birthdays, and export JSON for your system (validate or pretty print with the JSON Formatter & Validator).
- Teachers: Teach leap years and month arithmetic. Pair with Timeline Maker guide for history units.
- Project managers: Count working days between the kickoff and deadline, then publish a table with the Table Generator.
- Personal planning: Track milestones like 10,000 days old and set a reminder using your calendar app.
Accuracy tips
- Timezone consistency: Keep dates in your local timezone when comparing events that occur at midnight boundaries. For cross region meetings, check the Time Zone Converter guide and use the Time Zone Converter.
- Holiday sets: If your business uses a custom holiday list, import it so working day counts match internal policy. You can prep the list in the CSV Viewer & Editor.
- Edge cases: For Feb 29 birthdays, decide and stick to one rule for non leap years to avoid confusion.
Related tools and guides
- Word Counter guide for quick reports and briefs.
- CSV to HTML Table guide to publish date lists.
- Typing Test guide if you are preparing data entry workflows.
- Zodiac Sign & Horoscope Calculator for a fun companion view.
- Time Zone Converter guide for overlap etiquette and ICS exports.
- CSV Viewer & Editor guide for cleaning holiday files.
Try it now
Go to Age and Birthday Calculator
Frequently asked questions
- Is the Age and Birthday Calculator free
- Yes. Unlimited use and no login required.
- Do you upload or store my dates
- No. The calculator runs entirely in your browser. Your inputs stay on your device.
- Can I exclude public holidays in working day counts
- Yes. Toggle presets when available or import a CSV with holiday dates in ISO format. You can create or clean that CSV in the CSV Viewer & Editor.
- How do you handle time of birth
- If you enter a time, the seconds and hours breakdown uses it. If not, the tool assumes start of day in your timezone.
- Can I share a result
- Yes. Copy a summary or use the shareable link with prefilled dates for read only viewing. If you download a JSON record, you can format and validate it with the JSON Formatter & Validator.