Dates in excludes are ignored in Gantt diagrams

[gerukin]

Description

In Gantt diagrams, while excluding Saturdays or Weekends works, specific dates (ex: 2022-11-10) are ignored. Both with no styling and with no impact on task end dates.

Steps to reproduce

1. Add a Gantt diagram with an excluded date:

   ```mermaid
   gantt
     excludes 2022-11-08
   
     Task :2022-11-06, 4d
   ```

   gantt
     excludes 2022-11-08
   
     Task :2022-11-06, 4d
   

2. Unexpectedly matches the same diagram without the excluded date:

   ```mermaid
   gantt
     Task :2022-11-06, 4d
   ```

   gantt
     Task :2022-11-06, 4d
   

Screenshots

No response

Code Sample

gantt
  excludes 2022-11-08

  Task :2022-11-06, 4d

Setup

Desktop

• OS and Version: Mac
• Browser and Version: Chrome, Safari

Additional Context

Live editor (with date):

[gerukin]

Additional context...

It does work if the date format is explicitly given (even if using the default format):

gantt
	axisFormat %m-%d
	dateFormat YYYY-MM-DD
	excludes 2023-02-23, Weekends

	Span :active, span, 2023-02-22, 2d
	A :active, a, 2023-02-22, 1d
	B :after a, 2d

gantt
	axisFormat %m-%d
	dateFormat YYYY-MM-DD
	excludes 2023-02-23, Weekends

	Span :active, span, 2023-02-22, 2d
	A :active, a, 2023-02-22, 1d
	B :after a, 2d

---

Even there, there is still a failure case, when the start of the task is set to the excluded date, which is no longer skipped:

gantt
	axisFormat %m-%d
	dateFormat YYYY-MM-DD
	excludes 2023-02-23, Weekends

	Span :active, span, 2023-02-23, 2d