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Calculators

All DateToolsHQ calculators, grouped by category. Open a category for the full tool list, or jump straight to a calculator.

HR & Employment

Calculate notice periods, resignation dates, probation windows, employment duration, joining dates, and retirement timelines.

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Payroll

Calculate payroll cutoff dates, pay periods, next paydays, payroll calendars, hours totals, overtime pay, and prorated salary.

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Finance & Billing

Calculate invoice due dates, net payment terms, and prorated rent for partial billing periods.

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Contracts & Legal

Calculate contract end dates, expiry dates, durations, renewal deadlines, SLA deadlines, and license or certification renewal windows.

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Compliance & Regulatory

Calculate compliance deadlines, audit completion windows, and regulatory filing due dates with advance reminder milestones.

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Date & Business Days

Count calendar and business days, add or subtract days from a date, calculate date ranges and durations, convert date formats, and convert time zones.

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Countdowns

Count days until holidays, custom dates, birthdays, and seasonal events.

Browse all Countdowns