Business Time Tools
Calculate business days, deadlines, due dates, notice periods, and SLA targets.
Free date & business time tools
Hit deadlines, payroll dates, and countdowns—without spreadsheets
Count business days, invoice due dates, notice periods, payroll windows, and days-until milestones. Free calculators with clear rules on every page.
- 42Calculators
- 19Guides
- FreeNo signup
Popular Calculators
Fast starting points for deadlines, notice periods, and date math.
- Business Days CalculatorCount working days between dates, excluding weekends.
- Business Days Until Date CalculatorCount business days remaining until a target date from today or a…
- Invoice Due Date CalculatorCalculate invoice due dates from net payment terms with optional…
- Notice Period CalculatorCalculate notice period end dates from a start date and length in…
- Days Until CalculatorCount calendar days until any date—or days ago for past dates.
- Age CalculatorFind your exact age in years, months, and days.
Browse by Category
Six calculator groups—preview the top tools, then open a category for the full list.
Countdown calculators
Count down to a custom date or major holidays—calendar days, optional UTC times, and seasonal…
Date calculators
Count calendar days, age, and precise differences between dates.
Business day calculators
Count weekdays between dates, excluding weekends and optional holidays—then use Business Time…
Payroll calculators
Prorate salary or rent, total weekly hours, and estimate overtime gross pay.
Time utilities
Reformat dates, Unix timestamps, and time zones.
Guides
Plain-language references for business days, net terms, and calculator selection.
- Business Time Calculators GuideCentral guide to DateToolsHQ Business Time calculators—invoice due…
- Business Days vs Calendar Days GuideLearn what calendar days and business days mean, when each applies to…
- Business Days Between Dates GuideLearn how to count business days between two dates, when weekends and…
- Net Payment Terms GuideLearn what Net 30, Net 15, and other payment terms mean, how invoice…
- Invoice Due Date GuideLearn how invoice due dates are calculated from payment terms, when…
- Notice Period GuideLearn how notice periods work, how to calculate notice end dates in…