I cannot set the start date of the task to be less than 02/24/2025

[tvardovska.myroslava (Мирослава Твардовська)]

Year Plans.gan (6.0 КБ)

[DmitryBarashev]

22.02.2025 is a Sarturday, and in your project Saturday and Sunday are weekend days. Tasks can’t be scheduled on weekends in GanttProject.