# Week Number Calendar — calendar with week numbers

> calendar with week numbers (iPhone/iPad app by Maksim Efremov.)

- Source: https://appshunter.io/ios/app/week-number-calendar/id6753137789 (this page in markdown: same URL + `.md`)
- Developer: [Maksim Efremov](https://appshunter.io/developer/1842666296)
- Category: Productivity, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: American English
- Released: 2025-10-14
- Data updated: 2026-05-14
- User reviews in markdown: https://appshunter.io/ios/app/week-number-calendar/id6753137789/reviews.md

## What is Week Number Calendar?

Week Number Calendar - ISO 8601 Standard

  View week numbers for any year with this simple, clean calendar app. Perfect for business planning, project management, and international coordination.

  FEATURES:
  • Full year calendar with ISO 8601 week numbers
  • Current week and day is highlighted
  • Navigate between any year
  • Clean, easy-to-read interface
  • Available in English and Russian

  ABOUT ISO 8601 WEEK NUMBERS:
  Week numbers follow the international ISO 8601 standard, widely used in business worldwide. The first week of the year is the week containing the first Thursday, or equivalently, the week containing January 4th.

  This standard ensures consistent week numbering across countries and organizations, making it ideal for:
  • Business scheduling and planning
  • Project timelines and milestones
  • International team coordination
  • Manufacturing and logistics
  • Any work requiring precise week references

  Note: Due to the ISO 8601 standard, years can have 52 or 53 weeks, and dates near year boundaries may belong to the previous or next year's week count.


## Version history (last 2 releases)

### 1.0.1 — 2025-11-04

Added Russian language support in App Store

### 1.0 — 2025-10-14

No release notes.

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## More apps by Maksim Efremov

- [Running Voice](https://appshunter.io/ios/app/running-voice/id6755080384)
- [CallClip](https://appshunter.io/ios/app/callclip/id6755324329)
- [Young Schemas](https://appshunter.io/ios/app/young-schemas/id6755899152)

All apps by Maksim Efremov: https://appshunter.io/developer/1842666296

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*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 2026-05-14.*