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 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.
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.
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.
Convert Unix timestamps (epoch time) to dates and dates to Unix timestamps. Seconds, milliseconds, UTC, local time, and ISO 8601. Runs in your browser.
Calculate hours between two times or dates. See hours, minutes, and decimal hours, including overnight spans. Runs in your browser — times are not uploaded.
Enter your birth date to see your age on Mars, Mercury, Jupiter, and every planet—plus Earth days lived and your next planetary birthday. Free, private.
How old am I? Exact age in years, months, and days from date of birth—plus age as of any date, days lived, and next birthday. Free, private, no signup.
Enter your birth date to see your age on Mars, Mercury, Jupiter, and every planet—plus Earth days lived and your next planetary birthday. Free, private.
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.
Track employee work hours, unpaid breaks, overtime, and weekly timesheets for multiple employees. Optional pay estimates. Runs in your browser—no signup.
Calculate freelance hours, billable time, and earnings from your hourly rate. Track breaks and multiple sessions in the browser — no signup.
Calculate hours between two times or dates. See hours, minutes, and decimal hours, including overnight spans. Runs in your browser — times are not uploaded.
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.
Calculate your dog or cat's age in human years using age, months and dog size. See a quick age comparison, life stage and conversion instantly in your browser.
Calculate planet distances in AU, km and miles. Compare planets from the Sun, Earth-to-planet distances, light travel time and orbital scale.
Compare planet sizes side by side. See Earth, Jupiter, Saturn, Mars and every planet by diameter, volume and mass in your browser.
Convert Earth days to Mars sols, Jupiter days, and other planetary days. Compare planet day lengths in your browser.
Convert years between Earth, Mars, Jupiter, Saturn, Uranus, Neptune and more. See planetary year lengths and instant orbital-year conversions in your browser.
Calculate sunrise, sunset and daylight on Mars, Venus, Mercury and other planets. Adjust latitude and season to see local solar times, daylight and night length.
Free time calculator to add or subtract hours and minutes, find time between two times, and total durations in your browser.
Calculate the exact elapsed time between two times or dates in hours, minutes, and seconds, including overnight spans. Runs in your browser.
Free time zone converter for any date and time. Convert EST, PST, CST, UTC and cities worldwide with automatic daylight saving support.
Convert Unix timestamps (epoch time) to dates and dates to Unix timestamps. Seconds, milliseconds, UTC, local time, and ISO 8601. Runs in your browser.
Enter your Earth weight in lb or kg to see what you'd weigh on Mars, the Moon, Jupiter and every planet. Free, instant, browser-based.
Enter your Earth weight in lb or kg to see what you'd weigh on Mars, the Moon, Jupiter and every planet. Free, instant, browser-based.
Convert Unix timestamps (epoch time) to dates and dates to Unix timestamps. Seconds, milliseconds, UTC, local time, and ISO 8601. Runs in your browser.
Free time zone converter for any date and time. Convert EST, PST, CST, UTC and cities worldwide with automatic daylight saving support.
Calculate the exact elapsed time between two times or dates in hours, minutes, and seconds, including overnight spans. Runs in your browser.
Free time calculator to add or subtract hours and minutes, find time between two times, and total durations in your browser.
Calculate sunrise, sunset and daylight on Mars, Venus, Mercury and other planets. Adjust latitude and season to see local solar times, daylight and night length.
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 |
| Age Difference Calculator | Gap between two birth dates | How many years apart, age gap, who’s older |
| 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.
Use the Age Calculator for exact years, months, and days from a date of birth—including age as of a specific date and February 29 handling.
Use the Age Difference Calculator to compare two birth dates for an exact age gap in years, months, and days—and who is older.
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.
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Reviewed by EverydayTools Editorial Team on 2026-05-20.
Same workflow or intent — pick the next step without leaving the site.
Enter two birthdays to see who is older and the exact age gap in years, months, and days—plus how many days apart. Free, private, no signup.
Enter your date of birth to get exact age in years, months, and days. Age as of any date, days lived, and next birthday—free, private, 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 time zone converter for any date and time. Convert EST, PST, CST, UTC and cities worldwide with automatic daylight saving support.
Calculate the exact elapsed time between two times or dates in hours, minutes, and seconds, including overnight spans. Runs in your browser.
Calculate net work hours from clock-in, clock-out, and unpaid breaks—decimal output for timesheets. No upload: runs locally in your browser. Free.
Cross-category tools others open in the same session.
What is 20% of 500? Percent increase, decrease, difference, reverse %, markup & margin—runs locally in your browser, no upload. Copy results or share a link.
Free JSON formatter — paste minified or messy JSON and instantly get beautified, indented output with syntax highlighting and error detection. Browser-based, no server upload. Runs locally in your browser when supported—no upload required for normal use.
Free word counter — live word, sentence, and paragraph counts plus reading time for essays, blogs, and SEO drafts. Runs locally in your browser.
Free adult BMI from height and weight (lb/ft/in or kg/cm). CDC category, healthy weight range, optional waist. Screening only—runs in your browser.