Dates & everyday

Calculate days between dates, age, countdowns, weekdays and business days. Explore US federal holidays, time zones, percentages and unit conversions.

Dates & everyday

Date calculator: difference, add or subtract days

Calculate days between dates or add and subtract days, weeks, months or years. The weekday count excludes weekends only, not public holidays.

Dates & everyday

Age calculator

Exact age in years, months and days at any date, days until your next birthday and total days lived.

Dates & everyday

Countdown calculator

Days until (or since) any date, plus the dates of your 100th, 365th, 1000th day and yearly anniversaries.

Dates & everyday

Business days calculator

Count business days between dates or add working days to a date. Exclude weekends and US federal holidays for 2026–2035. Free calculator.

Dates & everyday

Day of the week calculator

Find the day of the week for a date. Check monthly payday weekdays and birthdays for the next 10 years with this free date calculator.

Dates & everyday

Work hours calculator

Enter clock-in, clock-out and break for each day to get daily hours and the total in h:mm and decimal (7.5 h). Overnight shifts supported; multiply by an hourly rate.

Dates & everyday

Percentage calculator

Five calculations on one page: X% of Y, X is what % of Y, percent change, add/subtract a percentage (and reverse), percentage-point difference.

Dates & everyday

Time zone converter

Compare cities side by side to arrange a call abroad, with a 24-hour strip for finding the hours everyone is at work. Handles daylight saving and half-hour offsets, entirely in your browser.

Dates & everyday

US federal holidays 2026–2035: dates & long weekends

See US federal holiday dates and observed days for 2026–2035. Find long weekends and plan breaks using 1–3 days of leave. Free calendar tool.

Dates & everyday

Discount calculator

Sale price from list price and %, discount rate from two prices, the real rate of stacked discounts like 30% + 20%, and percent-off vs. coupon order.

Dates & everyday

Unit converter

Square meters ↔ square feet, acres, hectares and Korean pyeong; meters ↔ feet and miles; kilograms ↔ pounds and ounces; liters ↔ gallons. Exact international factors with sources.