UMLCn 
年表图
Declaring tasks or milestone
plantuml
@startchronology
!include https://f.umlcn.com/c4.puml
title Chronology Diagram
[A: 2024-01-15 01:08:12] happens on 2024-01-15 01:08:12
[B] happens on 2024-01-15 13:08:12
[C] happens on 2024-01-15 22:12:08
@endchronology@startchronology
!include https://f.umlcn.com/c4.puml
title Chronology Diagram
[A: 2024-01-15 01:08:12] happens on 2024-01-15 01:08:12
[B] happens on 2024-01-15 13:08:12
[C] happens on 2024-01-15 22:12:08
@endchronology