Business Days Calculator
Calculate working days from today, add or subtract business days, or count business days between dates.
Frequently Asked Questions (FAQ)
Q: How do leap years affect date calculation?
Leap years contain 366 days with 29 days in February. The tool uses standard native calendar engines, handling February 29th and month boundaries seamlessly.
Q: How does the business days calculator exclude public holidays and observed days?
The calculator embeds statutory calendar rules for 14 countries or regions. When a holiday falls on a weekend, it applies each jurisdiction-specific observed rule (such as US OPM Friday/Monday in-lieu, Singapore MOM Monday in-lieu, or UK bank holiday substitution). Holidays falling on weekends are never double deducted.
Q: How do custom weekend rules affect observed holidays?
When you change regular rest days (for example, to Friday and Saturday), the observed holiday engine dynamically recalculates the applicable in-lieu days based on your actual workweek rather than forcing Monday defaults.
Q: How are Chinese compensatory shift workdays handled?
The engine supports official State Council compensatory shift schedules. Designated weekend working days are recognized as valid business days rather than deducted as weekends.
Q: Are both start and end dates included?
Total days calculate exact integer intervals between midnight boundaries. Full breakdown metrics provide weeks, months, and remainder days.
Q: Are birthdates or project deadlines sent to servers?
Never. All calculations run strictly in client-side JavaScript memory with zero network calls.