Date Calculator

Date Calculator

Work with calendar dates in YYYY-MM-DD form: measure how far apart two dates are, or shift a date by a number of days.

Capabilities

• Date span: Days between two dates, approximate weeks, and a calendar years / months / days breakdown. Optionally treat the end date as included in the span or as an exclusive boundary.
• Business days in range: Count of Monday–Friday days in that span; weekend days (Saturday and Sunday) counted separately.
• Add or subtract days: Move forward or backward from an anchor date by an integer number of days. Optionally skip weekends so only weekdays count as steps (still moves through the real calendar).

Gotchas

• Business days exclude Saturday and Sunday only — not public holidays or market calendars.
• YYYY-MM-DD is required; other formats are rejected.
• Inclusive end: When including the end date, the counted span follows that rule consistently for totals, business days, and weekend counts.