⏱️ Calendar & Dates
Explore all calendar & dates tools and solvers under the Date & Time Calculators category.
Exact Chronological Age Calculator
Calculate exact age in years, months, days, total weeks, hours, minutes, and countdown to your next birthday.
Open Calculator →Time Duration & Difference Calculator
Calculate elapsed time duration, hours and minutes difference between two timestamps, and decimal hours.
Open Calculator →Business Days & Working Day Calculator
Count business days between two dates, exclude weekends and holidays, or add/subtract working days from a start date for project and payroll planning.
Open Calculator →Date Calculator - Add & Subtract Days
Add or subtract days, weeks, months, and years from any date, calculate the exact duration between two dates in days, weeks, and months, and find the day of the week for any date.
Open Calculator →Work Hours Calculator (Shifts, Overtime & Pay)
Calculate daily and weekly work hours from shift start, end, and unpaid breaks, with overtime over 40 hours and weekly, monthly, and yearly gross pay.
Open Calculator →Sleep Calculator (Bedtime & Wake-Up by Cycle)
Bedtime and wake-up times aligned to 90-minute sleep cycles, with cycle counts, sleep durations, and a 15-minute fall-asleep buffer in either direction.
Open Calculator →Unix Timestamp Converter (Epoch ⇄ Date & Time)
Convert epoch timestamps in seconds or milliseconds to UTC, ISO, and local time — and turn any date and time back into Unix seconds, with a live ticking now.
Open Calculator →Days Until Calculator (Countdown to Any Date)
Count down to Christmas, birthdays, weddings, exams, or any date — days, weeks, months, hours, and the day of week, with a past-date days-ago mode.
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