Choosing the first weekday
Sunday-first calendars are common in the United States. Monday-first layouts align with ISO week conventions and are widely used elsewhere. Changing the setting rearranges the grid but does not change any date.
Leap-year February
February 2024 contains 29 days, while February 2025 contains 28. The generated grid applies the Gregorian leap-year rule automatically.
Printing reliably
Open print preview before saving or printing. Browser-added page titles, URLs, and dates can usually be disabled under “Headers and footers.” This page avoids background-dependent decoration so the date grid remains legible in black and white.