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Time facts, calculator guides, and fun date trivia.

What Day of the Week Was I Born? (Find Out Instantly)

Discover what day of the week you were born on and what it means. Monday's child is fair of face... which one are you?

The average human heart beats about 2.5 billion times in a lifetime. See exactly how many heartbeats you've had since birth with our live counter.

The next leap year is 2028. Learn why we have leap years, the 400-year rule, and see the full list of leap years from 2024 to 2100.

Complete breakdown of working days in 2025 by month. Includes US federal holidays and a monthly reference table for payroll and project planning.

One billion seconds equals about 31.7 years. Find out exactly when you hit your billionth second and other mind-blowing time facts.

Learn how many weeks are in a year, why some years have 53 weeks, and how leap years affect the count. Quick reference table included.

Find out exactly how many days, hours, minutes, and seconds until Christmas 2025 with our live countdown timer.

Find out exactly how old you are if you were born in 1990 — in years, months, days, hours, and even seconds. Plus fun facts about 1990 babies.