# KARL Business Day Calculator — Business Day Calculator Pro

> Business Day Calculator Pro (iPhone/iPad app by Janosch Zimmer.)

- Source: https://appshunter.io/ios/app/karl-business-day-calculator/id6759219225 (this page in markdown: same URL + `.md`)
- Developer: [Janosch Zimmer](https://appshunter.io/developer/1773332854)
- Category: Productivity, Business
- Price: Free
- Age rating: 4+
- Requires: iOS 26.2 · 1 MB
- Languages: American English
- Released: 2026-02-18
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/karl-business-day-calculator/id6759219225/reviews.md

## What is KARL Business Day Calculator?

KARL is the precise business day and deadline calculator for legal and financial workflows.
Whether contract deadlines, settlement dates, or compliance deadlines - calculate business days reliably and document every step with full audit trace.

For Lawyers, Bankers & Finance Professionals

BUSINESS DAY CALCULATOR (T+N)
Add or subtract N business days from a start date - non-business days are automatically skipped

ROLL CONVENTIONS
Adjust dates according to common market standards (Following, Preceding, Modified Following, Modified Preceding, Unadjusted)

LEGAL DEADLINE CALCULATION
Calculate statutory deadlines according to German law (BGB) with start rule, period (days/weeks/months/years), and optional business day adjustment

COUNT BETWEEN
Count business days between two dates - including or excluding boundaries

CALENDAR OVERVIEW
Visualize months/years with holiday lists and business/non-business marking per day

AUDIT TRACE WITH PROOF
Tabular documentation for each date with business day status, reason, and counter-check for plausibility verification

EXPORT & SHARE
Share reports as text, send via email, or copy directly to clipboard
Supported Calendars:
Germany (all federal states), UK Bank Holidays (England & Wales, Scotland, Northern Ireland), US Federal Holidays, TARGET2 (EU Payments)

KARL doesn't just show you the result - it documents every calculation step. Perfect for contracts, compliance documentation, and when every day counts.


## Version history (last 2 releases)

### 2.0 — 2026-02-19

New Dark Mode enabled via the Info-section; Added Information content and Legal Deadline calculation can be done for all supported Calendars including. TARGET2 (EU), US and UK!

### 1.0 — 2026-02-18

No release notes.

## More apps by Janosch Zimmer

- [J-Book: M&A](https://appshunter.io/ios/app/j-book-m-and-a/id6759403126)
- [Club COSMO](https://appshunter.io/ios/app/club-cosmo/id6759879794)

All apps by Janosch Zimmer: https://appshunter.io/developer/1773332854

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*