Our collection of calendar tools helps you manage your time, schedule events, and organize your daily activities. Create calendars, convert between formats, calculate dates, and plan your schedule efficiently without installing any software.
Calculate the number of hours between two dates with our free online tool.
Calculate leap years with our precise calculator. Perfect for project planning, scheduling, and time management.
Track your menstrual cycle with our free period tracker.
Printable calendar with holidays and events.
Convert times between different timezones around the world.
Calculate week numbers from dates or find date ranges from week numbers.
Convert weeks to months with our precise calculator. Perfect for pregnancy tracking, project planning, and time management.
Calculate working days and business hours for any year. Interactive calendar with customizable work schedule.
World Time is a tool that allows you to see the time in different cities around the world.
Understanding different calendar file formats is essential when working with scheduling applications.
Here are some of the most common formats you might encounter:
iCalendar format - the universal standard for calendar data exchange. Supported by all major calendar applications including Google Calendar, Outlook, and Apple Calendar.
Comma-separated values format for calendar data. Simple text format that can be easily imported into spreadsheets and databases for analysis.
Outlook Personal Storage Table format. Contains emails, calendar events, contacts, and other Outlook data in a single file.
JavaScript Object Notation for calendar data. Modern, lightweight format commonly used in web applications and APIs for data exchange.
Excel spreadsheet format for calendar data. Useful for creating detailed schedules, tracking events, and performing calculations on date/time data.
vCalendar format - predecessor to iCalendar. Legacy format still supported by some older calendar applications and devices.
Explore the leading calendar and scheduling applications for managing your time effectively
The most popular web-based calendar with seamless integration across Google services. Features smart scheduling, event suggestions, and excellent collaboration tools.
Enterprise-grade email and calendar solution with advanced scheduling features, meeting management, and deep integration with Microsoft 365 suite.
Native calendar app for macOS and iOS with beautiful design, natural language event creation, and seamless sync across Apple devices.
Integrated calendar within Notion's workspace platform. Perfect for teams who want calendar functionality alongside notes, databases, and project management.
Automated scheduling tool that eliminates back-and-forth emails. Share your availability and let others book meetings directly on your calendar.
Award-winning calendar app with powerful natural language parsing, beautiful design, and advanced features for power users across Apple platforms.