FormatCalc library
Date & time
without the noise.
Compare dates, count working days, validate ISO 8601 values, and translate named time zones. Timezone rules can change, so future schedules should be confirmed close to the event. Choose a tool below to get started—no account required.
Date Difference Calculator
Find the exact time between two dates.
Business Days Calculator
Count weekdays between two dates, excluding weekends.
ISO 8601 Date Converter
Validate an ISO 8601 date and convert it to standard date representations.
Time Zone Converter
Convert a date and time between IANA time zones.