Free date and time calculators for real life

NoteMide offers date and time calculators that explain their counting rules: compare dates, plan working-day deadlines, convert time zones, and track holidays with country and regional context.

Choose a calculator

Open a tool below to enter your dates and see a result in your browser. No calculator inputs are sent to NoteMide for processing. You do not need an account, a spreadsheet, or a subscription to use the core tools.

• Age calculator — Your exact age, down to the day.
• Days between dates — Count the space between any two dates.
• Date calculator — Move forward or backward from a date.
• Business days — Skip weekends and optional holidays.
• Week number — Find the ISO week for any date.
• Countdowns — Keep an eye on the moments ahead.
• Days until — Make a milestone feel closer.
• Time zone converter — Line up time across the world.
• Time duration — Measure the time between two moments.
• Deadline calculator — Find a target date from a workday plan.
• Notice period — Estimate a final date from notice length.
• Vacation days — Count weekdays in a time-off range.
• Leave duration — Turn leave days into an estimated end date.
• Project days — Estimate a finish date from workdays.
• Work hours — Measure net shift time after breaks.
• SLA deadline — Estimate expiry inside business hours.
• Time difference — Compare UTC offsets between locations.
• Meeting time planner — Compare a meeting hour across zones.
• World clock — See local times around the world.
• UTC offset converter — Find the offset for a timezone.
• DST change calculator — Find daylight-saving transitions.
• Business hours overlap — Find shared working hours.
• Date rollover calculator — See when a timezone changes the date.
• Rooftop solar calculator — Estimate panels, cost, subsidy and savings for India.

Calendar days, working days, or a moment worldwide?

Calendar-day tools compare dates or move a date forward and backward. Working-day tools answer different questions: a Monday-to-Friday range includes five weekdays, while advancing five working days excludes the starting day. Only tools with a holiday selector remove the selected country or regional holidays. Notice periods and SLA estimates still need the calendar and wording of the applicable employer policy or agreement.

Global Time tools use a selected date and named IANA time zones. The same instant can have different local dates, and daylight-saving changes can alter a city-to-city time difference. Include the local date and UTC offset when sharing a meeting or deadline rather than copying only a clock value.

Methods, guides and corrections

Read our calculation methodology to understand assumptions, or explore the NoteMide planning guides for examples of age, holiday, date, and time-zone calculations. Holiday tools link to official sources where jurisdiction-specific dates matter. NoteMide is a planning resource, not an official government calendar or a substitute for legal or employment advice. If a rule or result seems wrong, send a correction with the page, inputs, region, year, and expected outcome.