Day of the Week Finder – What Day Was July 4, 1776?
Enter any past or future date and instantly learn the day of the week. Uses the Zeller’s congruence algorithm for accurate results.
UD5 Toolkit
Click any month to see its quarter. Colors indicate quarter groupings.
Click a quarter segment to jump to its first month.
Enter any past or future date and instantly learn the day of the week. Uses the Zeller’s congruence algorithm for accurate results.
Select a date, time zone, and locale to see how it appears in various formats (long, short, etc.). Ensure correct i18n.
Find average first and last frost dates for your zip code using cached NOAA data. Garden planning essential.
Convert any date into Roman numerals (day‑month‑year) for tattoos or special occasions. Clean and local.
Enter any date and get its ISO week number, plus the start and end dates of that week. Quick reference.
Find out what day number of the year any date is (1‑366). Also shows days remaining. Simple reference.
Paste a human‑readable date (like 'next Friday' or 'March 5, 2023') and convert it to ISO 8601 format. Quick and tolerant.
Enter two date‑time values and get the exact years, months, days, hours, minutes difference. Word output also.
Calculate the exact number of days, weeks, months, and workdays between two dates. Visual calendar highlights. Perfect for projects.
Enter any date and get the ISO week number. Also shows start and end of that week. Handy for project planning.
Convert any human‑readable date to a Unix timestamp in seconds or milliseconds. Also shows ISO 8601. Clean interface.
Convert any date into Roman numerals (day‑month‑year) for tattoos or special occasions. Clean and local.
Find what day of the week any past or future date falls on. Uses Zeller’s congruence. Fun historical reference tool.
Enter a year to check if it is a leap year. Shows the rule explanation and next/previous leap years. Simple reference.
Create a personal countdown to any future date (birthday, vacation, launch). Shows days, hours, minutes, seconds. Locally stored.
Find the date of Easter Sunday for any given year. Learn about the computus algorithm. Simple and accurate.
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Ideal for developers debugging time-related code.
Find your exact age in years, months, and days. Calculate the time until your next birthday. All date computations are performed locally and accurately.