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TOOL TOPIC

Date, business day & time tools

Calculate deadlines, add or subtract dates, compare durations, and convert common date and time formats.

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Common tasks in this topic

Tools for business-day calculations, date arithmetic, durations, ISO 8601, Unix timestamps, calendars, countdowns, and time conversion.

1
Add or subtract business days from a date
2
Calculate differences between dates or times
3
Parse ISO 8601 and Unix timestamp values

Tools in this topic

Choose the tool that most closely matches the task you need to finish.

3–5 business days date range calculatorConvert a business-day range such as 3–5 days into earliest and latest calendar dates.Age calculatorCalculate age from a birth date and target date.Business days before a date calculatorSubtract N business days from a date while skipping weekends and optional excluded dates.Business days calculatorCount weekdays between dates with optional custom excluded dates.Business days from a date calculatorAdd N business days to a start date while skipping weekends and optional excluded dates.Date add / subtract calculatorAdd or subtract days/weeks from a date.Date difference calculatorCalculate the difference between two dates in days and weeks.ICS / iCalendar checkerCheck VCALENDAR / VEVENT structure, UID, DTSTART and basic fields.ISO 8601 date parser and converterParse an ISO 8601 datetime and convert it to UTC, local time and Unix timestamps.Japanese era / Gregorian date converterConvert Japanese era dates and Gregorian dates line by line.Run a Countdown Timer in Your BrowserCount down from a chosen duration in your browser.Run a Stopwatch with Lap Times in Your BrowserMeasure elapsed time and lap times in your browser.Time duration calculatorCalculate elapsed time between two clock times, including overnight.Unix timestamp converterConvert Unix seconds / milliseconds and human-readable dates.

Related references

Keep the relevant formats and units close while you work.

ISO 8601Open the related reference guideDate formatsOpen the related reference guideWorld calendarsOpen the related reference guide