# About Markets Open: independent China trading-day calendar

Who maintains Markets Open, what the nine exchange calendars cover, how facts are traced to official notices, and how to report a correction or license the data.

- Canonical: https://marketsopen.today/about
- English: https://marketsopen.today/about · Chinese: https://marketsopen.today/zh/about
- data_version: 2026.09.28-rc.6 · ui_version: 1.4.0

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This Markdown mirrors the HTML page. null/unknown means no assertion, never closed. Facts restated from official notices; notice text is not reproduced.