Days Between Dates

The tool provides a deterministic method to compute days between two dates using calendar arithmetic. It supports both calendar-day counting and business-day counting, and can include or exclude endpoints via an inclusive flag. The core idea is to transform input dates into a consistent internal representation and calculate the difference in whole days. This enables accurate planning for project timelines, travel itineraries, billing cycles, and academic deadlines. Users benefit from fast, repeatable results that can be integrated into reports, spreadsheets, or automated workflows. The tool differentiates between calendar days and business days, offering flexibility for various use cases without requiring external datasets. By handling leap years and time components (when provided) consistently, it minimizes rounding errors and miscounts. The result is a simple integer that can be reused in downstream calculations, schedules, or dashboards. The absence of holiday calendars keeps the core tool lightweight, while still delivering precise day counts for most standard planning scenarios. The feature set is designed for analysts, operations teams, educators, and developers who need reliable date-span metrics across projects and timelines.