Weekends appear to be offset in gantt diagrams

[arden13]

Description

When using the "exclude weekends" flag, the days appear to be off. A simple example below:

gantt
    axisFormat %b-%d-%y
    tickinterval 1d
    excludes weekends
            Act1: 2025-06-30, 3d
            Act2: 2025-07-09, 3d

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June 30 of 2025 is a monday, as is July 7 2025.

Steps to reproduce

put in the following code:

gantt
    axisFormat %b-%d-%y
    tickinterval 1d
    excludes weekends
            Act1: 2025-06-30, 3d
            Act2: 2025-07-09, 3d

receive chart

Screenshots

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Code Sample

Setup

• Mermaid version: 11.5.0
• Browser and Version: Chrome, Version 134.0.6998.177 (Official Build) (64-bit)

Suggested Solutions

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Additional Context

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