Description

In Gantt diagrams, when dateFormat is 'YYYY-MM-DD HH:mm:ss', excluding specific dates are ignored.

Steps to reproduce

a Gantt diagram code

gantt
    dateFormat YYYY-MM-DD HH:mm:ss
    excludes 2025-07-07
    section Section
        A task          :a1, 2025-07-04 20:30:30, 2025-07-08 10:30:30
        Another task    :after a1, 20h

Screenshots

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Code Sample

Setup

• Mermaid version: 11.7.0
• Browser and Version: Firefox 128.12.0esr

Suggested Solutions

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Additional Context

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