Calendars, holidays & schedules
Explore US federal holidays, state observances, and calculate durations between calendar dates.
Date & Time
9 toolsCalculate dates, track time, and view clocks across time zones.
Popular Date & Time tools
Start with the tools people use most often in this category.
US Events Calendar 2026–2028Explore all United States federal holidays, state observances, cultural festivals, shopping sales events, and major sports championships throughout 2026, 2027, and 2028.Age CalculatorCalculate exact chronological age in years, months, days, hours, and minutes from birth date at any target date.Date CalculatorCalculate days between dates or add/subtract years, months, weeks, and days simultaneously from any calendar date.Timer, Stopwatch and PomodoroOnline timer, precision stopwatch, and Pomodoro focus tracker with custom intervals and alarms.Work Hours & Timecard CalculatorCalculate weekly work hours, single shift durations, time rounding, lunch breaks, overtime, and gross paycheck estimate.Time Zone ConverterConvert dates and times across international time zones with DST support.
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Date and age calculations
Calculate time between calendar dates, work days, and exact chronological age.
Timers, stopwatches & countdowns
Track ongoing tasks, manage focus intervals, or count down to important events.
Global time and work hours
Coordinate across international time zones and sum work shift durations.
All Date & Time Tools
Showing 9 toolsUS Events Calendar 2026–2028
Explore all United States federal holidays, state observances, cultural festivals, shopping sales events, and major sports championships throughout 2026, 2027, and 2028.
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Time Zone Converter
Convert dates and times across international time zones with DST support.
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Business Days Calculator
Count Monday-to-Friday working days between two dates.
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Timer, Stopwatch and Pomodoro
Online timer, precision stopwatch, and Pomodoro focus tracker with custom intervals and alarms.
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Age Calculator
Calculate exact chronological age in years, months, days, hours, and minutes from birth date at any target date.
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Date Calculator
Calculate days between dates or add/subtract years, months, weeks, and days simultaneously from any calendar date.
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Full-Screen World Clock
Real-time full-screen digital and analog world clock for international cities and time zones.
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Work Hours & Timecard Calculator
Calculate weekly work hours, single shift durations, time rounding, lunch breaks, overtime, and gross paycheck estimate.
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Event Countdown Timer
Create live animated countdown timers to important dates, birthdays, and events.
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About Date & Time tools
UsefulGo date and time tools let you perform calendar arithmetic, count business days, convert world times, and measure durations entirely in your browser. All calculations use precise local calendar and time zone rules without sending your schedules or personal dates over the network.
Frequently asked questions
How does the Business Days Calculator treat weekends and holidays?
By default, the Business Days Calculator excludes Saturdays and Sundays from the date count. You can optionally exclude regional or national public holidays to match your business calendar.
How does the Age Calculator handle leap years and month lengths?
Our age calculator computes chronological age down to exact days, months, and years, accounting for leap years (including February 29th) and varying month lengths (28, 30, or 31 days) based on the Gregorian calendar.
Does the Time Zone Converter account for Daylight Saving Time (DST)?
Yes. The converter uses the standard IANA Time Zone Database, which automatically adjusts for past, present, and scheduled Daylight Saving Time transitions across global cities.
Can the Hours Calculator deduct breaks for payroll calculation?
Yes. You can enter shift start and end times along with unpaid lunch or break deductions to compute net payable work hours and track overtime.