Time and Date Converters & Calculators

Convert time units, calculate days between dates, find your exact age, track work hours, plan across time zones and look up week numbers - all in one place.

Time Converter

Convert between milliseconds, seconds, minutes, hours, days and years

Millisecond to secondSecond to millisecond
Date Difference

Days between dates, business days, weeks between dates and date arithmetic

Days Between DatesBusiness Days Calculator
Age Calculator

Calculate exact age, age in days, age difference and age at any date

Age CalculatorAge in Days
Work Hours

Hours worked, salary to hourly, overtime and freelance rate calculators

Hours Worked CalculatorSalary to Hourly Rate
Countdown & Duration

Days until date, time between events, duration converter and sleep calculator

Days Until DateTime Between Events
Time Zone

UTC offset converter, time zone difference, meeting planner and military time

UTC Offset ConverterTime Zone Difference
Date & Calendar

Week number, day of year, leap year checker, Julian day and Unix timestamp

Week Number CalculatorDay of Year Calculator

Need to figure out how many days between two dates for a project deadline, calculate your exact age in days for a milestone birthday, convert 1.75 hours to minutes for a timesheet, check what time it is in another UTC offset for a meeting, or look up the ISO week number for invoice filing? These time and date tools cover everything from millisecond-to-year unit conversion to age calculators, business day counters, salary-to-hourly converters, sleep cycle planners and Unix timestamp lookups. Whether you are a developer working with epochs, a freelancer tracking billable hours, a project manager counting sprints or a parent calculating a child's age for school enrollment - every tool works instantly with no sign-up required.

Frequently asked questions

Use the Days Between Dates calculator - enter start and end dates to get an instant count of total days, weeks and months. It handles leap years and varying month lengths automatically.

The Age Calculator takes your birth date and shows your precise age in years, months and days, plus total days alive and a countdown to your next birthday.

Multiply the decimal part by 60. So 1.75 hours = 1 hour 45 minutes (0.75 × 60 = 45). Common values for billing: 0.25 h = 15 min, 0.5 h = 30 min, 0.75 h = 45 min. The time unit converter handles all 56 unit pairs from milliseconds to years.

Divide your annual salary by 2080 (52 weeks × 40 hours). A $60,000 salary equals about $28.85 per hour. Our Salary to Hourly calculator also shows monthly, biweekly and daily rates.

Use the Week Number Calculator - enter any date to get the ISO week number (1-53), day of year and days remaining. Most business invoicing and project tracking systems use ISO week numbering.

Need other converters? Explore our metric converters, science & engineering, digital storage, cooking and finance calculators.