Date differences, age, time zones, working days. Live tools are linked first; planned tools are labeled until the calculator and supporting content are ready.
Open a live tool for calculator inputs, results, formula context, and published examples.
Find the exact calendar and total-day difference between two dates.
Add or subtract years, months, weeks, days, or business days from a date.
Calculate elapsed time or add hours, minutes, and seconds across midnight.
Track up to two shifts per day, unpaid breaks, weekly totals, and overtime in a printable summary.
Convert Unix seconds or milliseconds to dates and convert date/time values back to timestamps.
Find the ISO or US week for a date, or turn a week number back into its date range.
Calculate exact age in years, months, and days, then see the next birthday.
Count weekdays between dates or add working days while excluding weekends and entered holidays.