Date & Time calculators

Calculate exact age in years, months, and days between two dates.

Calculate the number of days, weeks, months, or years between two dates.

Calculate working days between dates while excluding weekends and optional holidays.

Estimate deadline date from start date, duration, business-day rules, and buffer days.

Calculate elapsed time between two times or dates with hours, minutes, and decimal-hour output.

Estimate thesis completion date from writing velocity, revision cycles, committee review, and defense buffer.

Estimate experiment start, incubation, observation, processing, and reporting timeline.

Estimate writing, review, figure, and formatting days remaining before a conference deadline.

Estimate remaining study weeks, assignment load, review time, and deadline pressure across a semester.

Calculate days, hours, minutes, business days, and milestone progress until a target date.

Estimate meeting overlap windows, offset differences, working-hour fit, and schedule friction.

Calculate worked hours, breaks, overtime, decimal hours, and billable time from time entries.

Estimate regular hours, overtime hours, weekly threshold usage, and payroll time split.

Calculate exact age difference in years, months, days, weeks, and milestone timing.

Calculate time until anniversary, elapsed years, next milestone, and recurring annual countdown.

Estimate pay-period start, end, paycheck date, remaining workdays, and payroll cycle timing.

Calculate renewal date, billing cycle progress, remaining days, and annualized subscription timing.

Estimate milestone dates from start date, duration, dependencies, buffer, and working-day assumptions.

Convert Unix epoch timestamps to calendar time, milliseconds, seconds, and timezone-adjusted date context.

Add, subtract, and compare hours, minutes, seconds, elapsed time, and clock-time intervals.

Calculate total hours worked from start time, end time, breaks, overtime rules, and decimal-hour conversion.