A clearer way to count days.

Datevora is a free collection of 30 date calculators. It helps with everyday calendar questions: how far apart dates are, how many working days remain, what weekday a date falls on, or when a recurring event will happen. It is supported by advertising, with no sign-up needed.

One calendar, clear conventions

The tools use the proleptic Gregorian calendar for years 1600–9999, even where a country historically used a different calendar. Inputs are date-only values. Calculations use UTC internally to avoid daylight-saving differences; this is not a time-zone converter. Today means the current date shown by your browser's local calendar.

Date differences exclude the start date. For weekday and weekend counts, the earlier boundary is excluded, the later one included, and reversed inputs change the sign. Adding business days excludes the starting day. National and regional holidays are not automatically supplied: enter the dates to exclude.

Months and leap days

Adding or subtracting months clamps to the final day of shorter months. For example, January 31 plus one month becomes February 28 in a common year. Adding years and age calculations use February 28 for non-leap anniversaries of February 29. The birthday tool offers February 28 or March 1 as a choice. These are stated calculation conventions, not statements about statutory age or legal deadlines.

Practical examples

Friday plus one working day is Monday if neither is excluded. January 1 to January 8 is seven calendar days. January 1, 2021 is in ISO week 53 of 2020 because ISO week numbering can cross a year boundary.

Independent checks

The calculation engine and automated tests are included in the source package. Inputs are not uploaded to a Datevora calculation server. The tools do not account for court rules, employment agreements, banking cutoffs, trading calendars or jurisdiction-specific deadlines. Check those requirements independently when they matter.

Open source

The application and calculation engine were created for this project with AI assistance and are available under the MIT License. No third-party date library is bundled. See the source guide for structure, tests and free hosting instructions.