Time tools

Time calculators

Calculate dates, durations, work hours, time zones, and business-day schedules.

Plan with clearer estimates

Time calculators help estimate ages, date ranges, work hours, and business-day schedules. Results can change when timezones, holidays, or endpoint rules differ.

Define whether endpoints count.
Check timezone assumptions.
Handle holidays separately when needed.

Age Calculator

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Age Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Date Difference Calculator

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Date Difference Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Work Hours Calculator

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Work Hours Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Business Days Calculator

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Business Days Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Time Duration Calculator

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Time Duration Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Time Zone Calculator

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Time Zone Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Overtime Calculator

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Overtime Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Countdown Calculator

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Countdown Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Hours Between Times Calculator

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Hours Between Times Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Days Until Calculator

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Days Until Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Weeks Between Dates Calculator

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Weeks Between Dates Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Months Between Dates Calculator

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Months Between Dates Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Pay Period Calculator

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Pay Period Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Meeting Time Calculator

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Meeting Time Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Unix Timestamp Calculator

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Unix Timestamp Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Time Card Calculator

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Time Card Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Vacation Days Calculator

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Vacation Days Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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School Days Calculator

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School Days Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Project Timeline Calculator

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Project Timeline Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Leap Year Calculator

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Leap Year Calculator for quick time estimates with clear formulas, worked examples, and copyable results.

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Days Between Dates Calculator

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Estimate the number of days between two day numbers for schedules, project planning, and simple date math.

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Helpful time guides

Use these guides to understand the assumptions behind the calculators and check your estimate before acting on it.