Date Calculator

The date calculator works in two modes: add or subtract a number of days from a starting date to find the resulting date, or enter two explicit dates to measure the span between them. Both modes can factor in public holidays from 200+ countries and regions to produce true working-day counts.

How the Two Modes Differ

Calculate mode starts from one date and moves forward or backward by a number of days you specify. The count begins from the day after the starting date — the starting date itself is not included in the tally. Results show start date, end date, total days, weekend days, holiday days, and working days.

Range mode takes an explicit start date and end date and measures the gap. Unlike Calculate mode, Range mode counts both the start and end dates. If you are matching a contractual or legal definition of "days between two dates," confirm which convention applies before choosing a mode.

Country, State, and City Holiday Levels

Enabling the holiday option makes the working-day count exclude public holidays for the selected region. The selector cascades across three tiers — country → state/province → city — and rules from all selected levels are merged automatically. For example, selecting mainland China includes Spring Festival, National Day golden-week adjustments, and Qingming Day. In the United States you can drill down to individual state holidays on top of federal ones.

Typical use: a 30-business-day deadline from 2024-03-01 in mainland China will land further out than a simple weekend filter, because Qingming Day falls inside that window.

Working-Day Definition

The tool uses the international Monday–Friday standard. In some Middle Eastern countries the working week runs Sunday–Thursday, so working-day counts will appear inflated when those countries' holiday data is selected. Adjust manually for those cases.