Date & Time

Date calculators, timezone converter, and timers

• Time Add/Subtract: Add or subtract hours and minutes with midnight rollover
• Working Hours Calculator: Calculate work shifts, timesheets, unpaid breaks and overtime, including overnight shifts
• Date Difference: Calculate the exact difference between two dates
• Timezone Converter: Convert date and time across multiple world timezones
• Workdays Calculator: Count business days (Mon–Fri) between two dates
• Leap Year Checker: Check if a year is a leap year
• Countdown Timer: Browser-based countdown timer and stopwatch
• Date Add/Subtract: Add or subtract days, months, years from any date
• Time Format Converter: Convert between seconds, HH:MM:SS, minutes, and hours