Weekday · Age · Milestones
What Day Was I Born?Find your weekday.
Enter your date of birth to see the weekday you were born, your age, moon phase, and more.
Birthday calculator
Your birthday results
Hours, minutes, and seconds are date-based approximations (birth treated as local midnight) because a birth time was not provided.
You were born on a
Approx. seconds alive
Assumes birth at local midnight.
Moon phase at birth
Upcoming milestones
What's it all mean?
Curious about stones, signs, animals, weekdays, the moon, and generations? Pick a topic.
How we calculate
Weekday, age, and leap-year results use standard calendar math in your local time zone. Hours, minutes, and seconds are approximate because this calculator accepts a date only, not a birth time. World-population age shares use a static mid-2020s age-structure snapshot. Chinese zodiac animals change at Chinese New Year; Western signs, birthstones, moon phase, and generations follow the conventions described in our methodology.