Age, date difference, and time calculators. Each tool is built for clear inputs, useful defaults, validation, and steps when the calculation needs context.
Age Calculator
Calculate exact age or date difference in years, months, days, total days, weeks, hours, weekdays, and next birthday countdown.
Time Duration Calculator
Add or subtract durations in days, hours, minutes, and seconds with normalized time output.
Time Zone Calculator
Convert a clock time between UTC offsets and show date rollover for simple time zone planning.
Days Between Dates Calculator
Count days and weeks between two dates with optional inclusive counting.
Business Days Calculator
Count weekdays between dates while excluding Saturdays and Sundays, with optional inclusive date counting.
Week Number Calculator
Find the ISO week number and ISO week-year for any date with weekday context.
Hours Calculator
Calculate elapsed hours between start and end clock times with break subtraction and overnight support.