Problem
Calendar math gets messy as soon as the clock matters.
A simple due-date calculation can become a support bug when it crosses weekends, holidays, business-hour windows, or time zones. A shared API keeps those deadlines consistent across tools.
When to use it
- You need support, logistics, legal, or admin deadlines with business-hour rules.
- You need repeatable US federal holiday-aware due dates across tools.
- You want to avoid copying deadline logic into every workflow.