Time and Date Calculators
Countdowns, birthdays, weekday checks, date differences, sleep planning and time-based fun.
Time Since CalculatorCount elapsed days, weeks and years.
Days Until CalculatorCount down to a target date.
Date Difference CalculatorCompare two dates.
Age CalculatorCalculate completed age.
90 Days From TodayFind a future date.
Unix Timestamp ConverterConvert Unix seconds.
Birthday CountdownDays until a birthday.
Sleep Cycle CalculatorEstimate a bedtime.
Day of the WeekFind the weekday for a date.
Half BirthdayFind the six-month birthday date.
Movie MarathonPlan watch time plus breaks.
Weekday CountdownCount weekdays before a date.
Calculation playbooks
Shortcuts, examples and related reading for people who want the math behind the tools.
Time calculator paths
For exact calendar planning, start with date difference or days until. For work and school planning, add weekday countdown because weekends can change the useful time available.