plantuml gantt example

@startgantt

<style>
ganttDiagram {
	task {
		FontName Helvetica
		FontColor black
		FontSize 12
		FontStyle
		BackGroundColor GreenYellow
		LineColor purple
                Padding 6
	}
	milestone {
		FontColor purple
		FontSize 12
		FontStyle italic
		BackGroundColor lightgreen
		LineColor purple
	}
	note {
		FontColor DarkGreen
		FontSize 12
		LineColor OrangeRed
	}
	arrow {
		FontName Helvetica
		FontColor red
		FontSize 12
		FontStyle bold
		BackGroundColor GreenYellow
		LineColor blue
		LineStyle 8.0;13.0
		LineThickness 3.0
	}
	separator {
		BackgroundColor lightgrey
		LineStyle 8.0;3.0
		LineThickness 1.0
		FontSize 12
		FontColor purple
		Margin 5
		Padding 1
	}
	timeline {
                FontName Courier
		FontColor black
                TitleFontSize 20
		BackGroundColor lightgrey
                
	}
	closed {
		BackgroundColor pink
		FontColor red
	}
}
</style>

printscale quarterly zoom 30
Project Starts 2023-01-01

[Prototype design] lasts 20 days
[Test prototype] lasts 10 days

-- Sep --

[New Task] lasts 20 days
[New Task 2] lasts 20 days 
[New Task 2] starts at [New Task]'s end
[Launch 0.5] happens at [New Task]'s end

-- Sep2 --

[Testing] lasts 2 weeks
[Testing] starts at [New Task 2]'s end

' ### MILESTONES ###

[Launch 1.0] happens at [Testing]'s end
' [Launch 1.0] happens at [New Task 2]'s end
' [Launch 1.0] displays on same row as [Launch 0.5]



@endgant