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.
Date Calculator
Add or subtract years, months, weeks, and days from a date with correct end-of-month clamping, weekday output, and step-by-step work.
Military Time Converter
Convert military (24-hour) time to 12-hour AM/PM time and back with the exact add-or-subtract-12 steps, both written formats, and the spoken form like fourteen thirty hours.
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.