Date, Time and Age Tools
Calculate ages, business days, work hours, overtime, time duration between dates, and world timezone conversions.
Tools in Date, Time and Age Tools (21)
Alphabetical & PopularAge Calculator
Calculate your exact age in years, months, weeks, days, hours, and minutes from your date of birth.
Date Calculator
Add or subtract days, weeks, months, or years from any starting date.
Date Difference Calculator
Calculate the total number of years, months, and days between two selected calendar dates.
Days Between Dates Calculator
Count the exact number of calendar days between two dates, with optional end-date inclusion.
Business Days Calculator
Calculate working business days (Monday to Friday) between dates, excluding weekends and US federal holidays.
Time Duration Calculator
Calculate elapsed time between two clock times (hours, minutes, seconds).
Time Calculator
Add and subtract hours, minutes, and seconds from a starting time.
Countdown Calculator
Live countdown timer to any upcoming event, holiday, birthday, or product launch.
Birthday Calculator
Discover the exact day of the week you were born, days until next birthday, and life milestones.
Due Date Calculator
Calculate pregnancy estimated due date (EDD) based on last menstrual period (LMP) or conception date.
Work Hours Calculator
Calculate daily and weekly work hours, deducting unpaid lunch breaks, for timesheet tracking.
Overtime Calculator
Calculate overtime pay at 1.5x (time-and-a-half) or 2.0x (double time) according to US Fair Labor Standards (FLSA).
Time Zone Converter
Convert time between US time zones (ET, CT, MT, PT, AK, HI) and international global zones (UTC, GMT, CET, JST).
Meeting Time Planner
Find overlapping working hours across multiple remote team member locations and time zones.
Unix Timestamp Converter
Convert Unix epoch timestamps (seconds and milliseconds) to human-readable dates and vice versa.
Week Number Calculator
Find the ISO 8601 and US calendar week number for any selected date of the year.
Calendar Generator
Generate clean, printable monthly or yearly calendar grids with custom note areas.
Sleep Calculator
Calculate the optimal bedtime and wake-up times based on natural 90-minute REM sleep cycles.
Day of the Week Calculator
Find out which day of the week (Monday, Tuesday, etc.) any historic or future date falls on.
Random Date Generator
Generate random dates and timestamps between custom start and end date ranges.
Billable Hours Calculator
Calculate total billable client hours, invoice totals, and billable utilization efficiency.
About Date, Time and Age Tools on TTech
Are these tools private and secure?
Yes. All date, time and age tools are engineered to execute calculations and processing within your local web browser, protecting your privacy and confidential data.
Can I use these tools on mobile devices?
Every tool is responsive and optimized for mobile screens, tablets, laptops, and desktop computers.