Astronomical, Religious & Lifestyle
Track moon phases, holy days, pregnancy dates, and custom countdowns.
Moon Age Calculator
Calculate the exact age of the moon in days since the last new moon phase.
Moonrise & Moonset Calculator
Determine the exact time the moon will rise and set based on your coordinates.
Solar & Lunar Eclipse Tracker
Find the dates, times, and visibility paths of upcoming solar and lunar eclipses.
Meteor Shower Calendar
Track the peak dates and expected zenithal hourly rates (ZHR) for major meteor showers.
Planet Visibility Calculator
Find out when and where planets like Mars, Jupiter, and Venus are visible in the night sky.
Tide Times Calculator
Estimate high and low tide times based on lunar cycles and coastal zones.
Season Start/End Calculator
Calculate the exact astronomical start and end dates of Spring, Summer, Autumn, and Winter.
Zodiac Cusp Calculator
Determine if a birth date falls on the exact borderline (cusp) between two zodiac signs.
Chinese Zodiac Calculator
Find your Chinese Zodiac animal and elemental sign based on the lunisolar calendar.
Celtic Tree Astrology Calculator
Discover your Celtic tree sign based on ancient Druid lunar assignments.
Biorhythm Calculator
Map your physical, emotional, and intellectual cycles based on your exact birthdate.
Numerology Life Path Calculator
Calculate your single-digit Life Path number by reducing your birth date.
What Happened on This Date?
Find major historical events, births, and deaths that occurred on a specific month and day.
Famous Birthdays Tools
Discover which celebrities, historical figures, and leaders share your exact birthday.
Day of the Week Personality Calculator
Explore traditional folklore and nursery rhymes based on the weekday you were born.
Age in Dog Years
Convert a human birthday into equivalent dog years using modern size/breed formulas.
Age in Cat Years
Calculate feline equivalent age considering their rapid early development timeline.
Age on Other Planets
Calculate your age in Martian years, Jovian years, and other orbital periods.
1 Billionth Second Calculator
Find the exact date and time you will be (or were) exactly 1 billion seconds old.
Half-Birthday Calculator
Calculate the exact date that falls exactly 6 months from your birthday.
Pregnancy Due Date Calculator
Estimate your delivery date based on LMP, conception date, or ultrasound.
Conception Date Calculator
Work backwards from a due date to find the most likely conception window.
Ovulation Calculator
Estimate fertile windows based on menstrual cycle lengths.
IVF Due Date Calculator
Calculate an exact due date based on 3-day or 5-day embryo transfer timelines.
Wedding Countdown Generator
Create a shareable countdown to the big day including months, weeks, and days.
Anniversary Calculator
Track upcoming milestones (Bronze, Silver, Gold) and calculate total married days.
Retirement Countdown
Calculate working days remaining until your target retirement date.
Vacation Countdown Widget
Set a future date and generate a countdown for your upcoming PTO or holiday.
Sobriety Time Calculator
Track total continuous days, months, and years of sobriety recovery time.
Habit Streak Calculator
Calculate consecutive days a habit has been maintained and visually map progress.
Intermittent Fasting Timer
Calculate exactly when your 16:8 or 20:4 fasting window opens and closes.
Ramadan Fasting Calendar
Calculate exact Suhoor and Iftar times based on local solar positions.
Easter Date Calculator
Calculate the shifting date of Easter Sunday for any given year historically or in the future.
Thanksgiving Date Calculator
Find out exactly which Thursday in November Thanksgiving falls on in upcoming years.
Mother's Day / Father's Day Tracker
Calculate the exact dates for these floating holidays across international regions.
Black Friday & Cyber Monday Tracker
Find the exact dates for upcoming major retail shopping events.
Tax Day Countdown
Calculate the time remaining until the US IRS federal tax filing deadline.
Leap Second Historical Log
Review all the dates where the IERS added an artificial leap second to UTC.
Year 2038 Problem Tracker
Countdown to the UNIX epoch overflow event known as Y2K38.
Doomsday Clock Tracker
Information and history on the Bulletin of Atomic Scientists' symbolic clock.