Date Calculator Guide
A date calculator computes the difference between two dates, adds or subtracts days from a starting date, and counts business days excluding weekends. Project managers use it to set deadlines, HR teams to calculate tenure and accruals, and travelers to plan multi-leg trips. The tool handles month lengths, leap years, and time-zone edge cases that trip up manual arithmetic. It turns fiddly date math into a single click so you can focus on the schedule itself. The calculator parses your input dates into Unix-style timestamps so arithmetic happens at the day level without time-of-day ambiguity. Difference mode subtracts the two timestamps and breaks the result into days, weeks, months, and years. Add and subtract mode advances the timestamp by a chosen number of days, weeks, or months while respecting calendar rollovers like month-end and leap years. Business-day mode iterates through each day in the range, skipping Saturdays and Sundays and optionally skipping holidays you specify.