Date & Time tools
Date & Time Tools
Choose by the time question you need answered: count calendar days, add or subtract dates, skip weekends, find age, total hours and breaks, estimate overtime, compare time zones or count down to an event.
Date & Time tools are designed to run in your browser where practical, so results appear quickly and do not require an account.
Start with the job
These shortcuts separate calendar math, work-hour totals and time-zone planning so you can open the right tool first.
How many calendar days are between two dates?
Calculate calendar days between two dates, with optional end-date inclusion and practical week or calendar breakdowns.
Use Date DurationWhat date is it after adding days, weeks, months or years?
Add or subtract days, weeks, months and years from a start date with clear month-end handling.
Use Date CalculatorHow many weekdays remain after weekends and custom excluded dates?
Count business days between two dates while excluding selected weekend days and custom holidays or dates.
Use Business DaysWhat is the age in years, months and days on a date?
Calculate age from a birth date to today or another selected date, with years, months, days and total days.
Use AgeHow much time is between these two times?
Calculate elapsed time between two times or datetimes, including overnight spans, hours, minutes and decimal hours.
Use Time DurationHow many hours are on this time card?
Total daily and weekly time card hours from shift start times, end times and break durations.
Use Time CardHow many work hours are in this date range?
Estimate total work hours over a date range from selected workdays, hours per day, breaks and manual excluded dates.
Use Work HoursHow much gross pay is this regular and overtime work?
Estimate regular pay, overtime pay and gross pay from entered hours, hourly rate and overtime multiplier.
Use OvertimeWhat time is this in another time zone?
Convert a selected date and time from one IANA time zone to another with daylight saving handled by browser timezone data.
Use Time Zone ConverterWhat time is this meeting for everyone?
Enter one proposed meeting time and compare the local time across multiple IANA time zones.
Use Meeting Time PlannerHow long until this date or event?
Calculate the time remaining until a target date and time, or show how long ago a past target passed.
Use CountdownGuides and methodology
Use the chooser guide when you are deciding between calendar-day, business-day, work-hour and time-zone tools. The support notes explain shared methodology and browser-side behaviour.
All Date & Time tools (11)
A grouped list of calendar, work-time, time-zone and countdown tools, ordered by the jobs people usually need first.
Calendar dates
Count date spans, add or subtract dates, skip weekends and calculate age on a selected date.
Date Duration Calculator
Count days between dates
Calculate calendar days between two dates, with optional end-date inclusion and practical week or calendar breakdowns.
Use Date DurationDate Calculator
Add or subtract from a date
Add or subtract days, weeks, months and years from a start date with clear month-end handling.
Use Date CalculatorBusiness Days Calculator
Count weekdays and exclusions
Count business days between two dates while excluding selected weekend days and custom holidays or dates.
Use Business DaysAge Calculator
Calculate age on a date
Calculate age from a birth date to today or another selected date, with years, months, days and total days.
Use AgeWork time and pay
Total hours, breaks, workdays and basic gross overtime before payroll rules or deductions.
Time Duration Calculator
Find hours between two times
Calculate elapsed time between two times or datetimes, including overnight spans, hours, minutes and decimal hours.
Use Time DurationTime Card Calculator
Total shift rows and breaks
Total daily and weekly time card hours from shift start times, end times and break durations.
Use Time CardWork Hours Calculator
Estimate hours over workdays
Estimate total work hours over a date range from selected workdays, hours per day, breaks and manual excluded dates.
Use Work HoursOvertime Calculator
Estimate regular and overtime gross pay
Estimate regular pay, overtime pay and gross pay from entered hours, hourly rate and overtime multiplier.
Use OvertimeTime zones and events
Convert times, compare meeting slots across zones or count down to a date.
Time Zone Converter
Convert one time between zones
Convert a selected date and time from one IANA time zone to another with daylight saving handled by browser timezone data.
Use Time Zone ConverterMeeting Time Planner
Compare a meeting across zones
Enter one proposed meeting time and compare the local time across multiple IANA time zones.
Use Meeting Time PlannerCountdown Calculator
Track time until an event
Calculate the time remaining until a target date and time, or show how long ago a past target passed.
Use CountdownHow to choose a date or time tool
Use calendar-day tools for ordinary date spans and offsets. Switch to Business Days when weekends or custom excluded dates matter. Use work tools for hours and gross pay, and use time-zone tools when the same clock time needs to be understood in more than one place.
What these tools do not include
Date & Time tools do not provide legal, payroll, tax or HR advice, do not sync with calendars, and do not infer public holidays from your location. Enter excluded dates yourself where a tool supports them.
FAQs
Which Date & Time tool should I start with?
Start with the job: Date Duration for days between dates, Date Calculator for adding or subtracting time, Business Days when weekends or exclusions matter, Age for birth-date math, Time Card or Work Hours for schedules, and Time Zone or Meeting Planner for cross-zone planning.
What is the difference between Date Duration and Date Calculator?
Date Duration counts the span between two dates. Date Calculator starts with one date and adds or subtracts days, weeks, months or years.
When should I use Business Days instead of Date Duration?
Use Business Days when weekends or manually entered excluded dates should be skipped. Use Date Duration when every calendar day should count.
Do these tools include public holidays automatically?
No. Business Days Calculator lets you enter custom excluded dates, but the Date & Time hub does not include a full public holiday database.
How should I handle time zones and daylight saving time?
Use Time Zone Converter for one time and Meeting Time Planner for several zones. These tools rely on browser-supported time-zone data, so check important times around daylight saving transitions.
Do the Date & Time tools store my entries?
They are designed to run in the browser where practical and do not require an account.
Do the work tools give payroll advice?
No. Work and overtime tools are general estimates only and do not interpret employment law, contracts, payroll deductions, taxes or HR policy.