Are date and time tools private?
Date & Time Tools (/date-and-time) runs in your browser when supported—inputs are not uploaded to EverydayTools servers.
Calculate age, date differences, work hours, overtime, and time zones—built for leap years and DST. Everything runs in your browser; your dates never leave your device.
Calculate exact age from date of birth—years, months, days, next birthday. No upload: runs locally in your browser. Free, no signup.
Free age on other planets calculator — find your age on Mars, Venus, Mercury, Jupiter, Saturn, Uranus, Neptune, and Pluto based on each planet's orbital period. No signup. Runs locally in your browser when supported—no upload required for normal use.
Subtract lunch and breaks from shift times to get net work hours. No upload—runs locally in your browser. Free for timesheets, no signup.
Add or subtract days, weeks, months, or years from any date. Days-between mode included. No upload—runs locally in your browser. Free, no signup.
Free employee hours tracker — log start/end times, breaks, and overtime for multiple employees. Calculate weekly totals and prepare payroll summaries. No signup required. Runs locally in your browser when supported—no upload required for normal use.
Free freelance hours calculator — log start and end times for multiple projects to calculate total billable hours and estimate earnings at your hourly rate. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free hours calculator — calculate the total time between any two times, including overnight spans. See results in hours and minutes or decimal format. No signup required. Runs locally in your browser when supported—no upload required for normal use.
Free hours calculator with breaks — enter start time, end time, and break duration to calculate net work hours. Perfect for payroll and timesheet accuracy. No signup required. Runs locally in your browser when supported—no upload required for normal use.
Free overtime hours calculator — enter daily hours worked and your regular schedule limit to calculate total overtime hours. Supports daily and weekly overtime rules. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free pet age calculator — convert your dog or cat's age into equivalent human years using breed-adjusted formulas. Great for understanding your pet's life stage. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free planet distance converter — convert between astronomical units (AU), kilometers, and miles for solar system distances. See how far each planet is from the Sun. No signup. Runs locally in your browser when supported—no upload required for normal use.
Compare Mercury–Pluto diameters, masses & volumes vs Earth. NASA reference charts, ratios, shareable URLs—runs locally in your browser, no signup or upload.
Convert Mars sols, Jupiter days, and planet rotations to Earth days. NASA rotation data, instant ratios—runs locally in your browser, no signup or upload.
Convert Earth years to orbital years for all planets. A Mars year is 1.88 Earth years; a Neptune year is 165 Earth years. Browser-based, no signup, uses NASA IAU orbital data. Runs locally in your browser when supported—no upload required for normal use.
Calculate day, evening, or overnight shift hours with break deductions. Runs locally in your browser—never uploaded. Free for nurses and shift workers.
How long does daylight last on Mars, Venus, or Jupiter? Explore sunrise and sunset times based on each planet's rotation period and axial tilt. Browser-based, no signup. Runs locally in your browser when supported—no upload required for normal use.
Free time calculator — add or subtract hours, minutes, and seconds, or calculate the exact duration between two times. Handles overnight spans automatically. No signup required. Runs locally in your browser when supported—no upload required for normal use.
Convert seconds, minutes, hours, days, weeks, and years instantly with live multi-unit calculations and accurate results. Runs locally in your browser when supported—no upload required for normal use.
Free time duration calculator — calculate the exact duration between two dates or times in days, hours, minutes, and seconds. No signup required. Runs locally in your browser when supported—no upload required for normal use.
Convert time between cities and IANA time zones with DST handled automatically. No upload—runs locally in your browser. Free, no signup.
Free timesheet calculator — log daily work hours and breaks for a full week, calculate total regular and overtime hours, and prepare a payroll-ready timesheet. No signup. Runs locally in your browser when supported—no upload required for normal use.
Convert Unix epoch to readable dates and back—seconds or milliseconds, UTC and local. No upload: runs in your browser. Free, no signup.
How much would you weigh on Mars (38% of Earth), Jupiter (2.5×), or the Moon (16.5%)? Free weight on other planets calculator using NASA surface gravity values. No signup. Runs locally in your browser when supported—no upload required for normal use.
Free date and time calculators find exact age, days between dates, net work hours with breaks, time zone conversions with DST, and decimal hours for payroll—all in your browser with no upload to a server.
Pick any tool below, enter your values, and copy the result in seconds.
No signup · Local processing · Leap years & DST aware
Date and time tools calculate ages, days between dates, durations, work hours, overtime, and time zone conversions—handling leap years, month lengths, and daylight saving time in your browser.
Date and time tools answer everyday calendar and clock questions that are easy to get wrong by hand: exact age from a birth date, days until a deadline, net hours after lunch, or what time a meeting is in another city.
Good calculators use real calendar rules—February in leap years, varying month lengths, and IANA time zones so DST shifts apply on the correct date. Work-hours tools convert clock times to decimal hours (7:30 = 7.5) for timesheets.
EverydayTools runs these calculators in your browser. Dates of birth, schedules, and shift times are not uploaded to our servers.
Pick the tool for your task—age, date math, duration, time zones, or work hours—then copy decimal or calendar results into forms and payroll.
Concise answers for common searches — definitions, steps, and comparisons.
Date & Time Tools (/date-and-time) runs in your browser when supported—inputs are not uploaded to EverydayTools servers.
Decimal hours = 7 + (30 ÷ 60) = 7.5—not 7.30, which would mean seven hours and eighteen minutes.
Date Calculator adds or subtracts calendar days/weeks/months. Time Duration Calculator measures elapsed time between two timestamps including hours and minutes.
Age, date difference, add/subtract dates, time duration, time zones, daily work hours, or weekly timesheets.
Use pickers or type values. Include time-of-day when you need hour/minute precision.
Confirm DST for zone conversions and whether breaks are paid or unpaid for work hours.
Paste into forms, payroll notes, project plans, or calendar invites.
Common real-world scenarios where this tool saves time.
Net work hours, overtime splits, and weekly totals for timesheets and compliance checks.
Days between milestones, warranty windows, and add/subtract days from a start date.
Convert meeting times across zones without DST mistakes when US and EU shift on different weeks.
Exact age in years, months, and days for visa, insurance, and government forms.
Step-by-step chains that connect related tools for common tasks.
Input
Start: 2026-05-01, End: 2026-06-15Output
45 calendar days (with week/month breakdown)Date difference tools handle month boundaries and leap years automatically.
Input
Start 9:00 AM, End 5:30 PM, Break 45 minOutput
7.75 decimal hoursSubtract unpaid breaks before multiplying by an hourly rate.
Input
2:00 PM America/New_York → Europe/London on 2026-11-05Output
Converted time reflects DST rules for that dateOffsets change during DST—always convert using the meeting date.
Calendar math uses date-aware arithmetic. Time zones use IANA rules per selected date. Work hours convert to minutes, subtract breaks, then output hh:mm and decimal hours.
Match your task to the calculator on this hub.
| Tool | Best for | Use when… |
|---|---|---|
| Age Calculator | Years, months, days from DOB | Forms, milestones, leap-year birthdays |
| Date Calculator | Add/subtract calendar units | Deadlines, warranties, 90-day windows |
| Time Duration Calculator | Elapsed hours/minutes | Billing blocks across timestamps |
| Time Zone Converter | Global meetings | DST-aware conversion for a specific date |
| Daily Work Hours | One shift net hours | Clock-in, clock-out, unpaid breaks |
| Work Hours Calculator | Daily + weekly + OT | Full timesheet and pay estimate |
| Method | Counts | Typical use |
|---|---|---|
| Calendar days | Every day including weekends | Contracts, age, shipping windows |
| Business days | Weekdays only (tool-specific) | SLAs, court deadlines, bank processing |
| Decimal hours | Fraction of an hour | Payroll multiply by hourly rate |
Likely cause: DST or wrong date used for conversion.
Fix: Re-run with the meeting date and correct IANA zones (e.g. America/New_York).
Likely cause: Unpaid breaks not deducted or overnight shift not handled.
Fix: Enter break duration; overnight shifts add 24h to end automatically.
Likely cause: Form may use age at last birthday vs exact years/months/days.
Fix: Match the format requested and confirm the reference date.
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Use the Date Calculator—it counts exact calendar days and handles month boundaries and leap years.
Yes. February 29 and cross-year spans are included automatically in age and difference tools.
Daylight saving time changes offsets by date. Convert using the meeting date and correct IANA time zones.
Decimal hours = hours + (minutes ÷ 60). Example: 7:45 = 7.75 hours.
Yes. Enter unpaid break minutes; net time is returned in hh:mm and decimal hours.
Yes—free with no signup and no usage limits on this hub.
Date Calculator for calendar add/subtract. Time Duration for precise elapsed time between two timestamps.
Yes—use Work Hours Calculator weekly mode or related timesheet and overtime tools linked from this hub.
Age Calculator returns years, months, and days from date of birth, including February 29 handling.
Date & Time Tools (/date-and-time) runs in your browser when supported—inputs are not uploaded to EverydayTools servers.
Calendar math uses leap years and real month lengths; time zone tools apply DST for the date you select.
Results are for convenience. For payroll, compliance, or legal deadlines, verify with official policy and local rules.
More free tools for the same workflow.
Calculate exact age in years, months, and days from your DOB. Zodiac, Korean age, milestones, next birthday, age difference with timeline, print & share—free, 100% in your browser.
Add or subtract days, weeks, months, or years from any date. Days-between mode included. No upload—runs locally in your browser. Free, no signup.
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Reviewed by EverydayTools Editorial Team on 2026-05-20.