Dates & Calendars

Epoch Timestamp Converter Convert Unix timestamps to human-readable dates and back — local, UTC and ISO 8601, in your browser. Days Between Dates Calculator Count the days, weeks, months and business days between two dates — right in your browser. Age Calculator Find the exact age in years, months and days, with total days lived and the countdown to the next birthday. Add or Subtract Days from a Date Add or subtract days, weeks, months or years from any date, with correct end-of-month handling. What Day of the Week Was It? Find the day of the week of any date from 1583 to 9999, with day of the year, ISO week and leap-year facts. Week Number Calculator Find the ISO 8601 week number of any date — and the exact dates of any week number. Time Zone Converter Convert any date and time between two time zones, with the live difference — in your browser. Leap Year Checker Check whether any year is a leap year, with the rule explained and the next leap years listed. Brazilian Calendar with National Holidays See every month of any year with all Brazilian national holidays marked — fixed and moveable, derived from Easter. Business Days Calculator Count the business days between two dates, excluding weekends and Brazilian national holidays. Procedural Deadline Calculator (CPC) Count a CPC procedural deadline in business days or calendar days from the date of service, with Brazilian national holidays excluded. Golden Hour Calculator Find the golden hour and blue hour times for any latitude and date — for photography planning. Movable Dates Calculator Find Carnival, Easter, Corpus Christi, Mother's Day and other movable dates for any year. Lunar Calendar See the moon phase for any date and browse a full month of phases. Season Calculator Enter a date to see the season and the next equinox or solstice.