Calendar

Calendar helpers: day of week, day of year, week number, leap years, Roman numerals, and timestamps.

6 free calendar tools, no signup.

• Date to Roman Numerals ConverterConvert any date to Roman numerals for tattoos and invitations. Choose the day, month, and year order and the separator between them.
• Date to Unix Timestamp ConverterConvert a date and time to a Unix timestamp in seconds and milliseconds. Enter any UTC date and time and get the epoch value instantly.
• Day of the Week CalculatorFind the day of the week for any date, plus the day of the year, weekend status, and leap-year status.
• Day of Year CalculatorFind the ordinal day number of any date, from 1 to 365 or 366, plus days remaining in the year.
• Leap Year CalculatorCheck if a year is a leap year, see its number of days, and find the next leap year. Uses the full Gregorian rule, including the 100 and 400 year exceptions.
• Week Number CalculatorFind the ISO 8601 week number for any date, with the ISO week-year and day of the week. Handles the week 53 and year-boundary cases correctly.