Free Online Tools

View current time in multiple cities simultaneously. Add/remove cities. 12/24 hour format.

Find the best meeting time across multiple timezones. Visual overlap of working hours.

Calculate days until any future event. Shows days, weeks, months, hours, minutes countdown.

Calculate how many days have passed since any past date. Shows total days, weeks, months.

Calculate business days between dates, excluding weekends and optionally holidays.

Find the ISO week number for any date. Shows current week number with calendar view.

Check if any year is a leap year. Shows the rule explanation and next leap years.

Generate printable monthly calendars. Customizable start day, holidays, and events.

Calculate sunrise, sunset, golden hour, and twilight times for any location and date.

View moon phases for any month. Full moon, new moon, waxing, waning with illumination percentage.

Convert dates to/from ISO 8601 format. Supports timestamps, durations, and intervals.

Calculate dates for recurring events — daily, weekly, biweekly, monthly, yearly. List all occurrences.