Time & date tools

Validate if a date is after another date or the current date using the validator.js isAfter function

Calculate and predict your next period date based on cycle length. Enter your last period start date to see predicted menstrual cycle dates on a visual calendar.

Generate random public holidays from any country worldwide. Select a country and year to get random national holidays from over 199 countries.

Timer with rotation alerts for grilling, BBQ and cooking. Set total cooking time and rotation intervals to get audio notifications when it's time to flip or turn your food.

Calculate the next and previous leap year for any given year

Real-time high-precision digital clock displaying hours, minutes, seconds, and milliseconds with fullscreen mode and customizable appearance

Generate a list of dates between two dates with customizable step, format, and separator

Add or subtract days, weeks, months, and years from any date with detailed result information

Find ISO week number, day of year, quarter, and week date range for any date