Date is showing an another date than I generated from my database

[rondaniel]

Is date a long with the milliseconds since january 1. 1970? If I convert 2022.01.10 into milliseconds since 1970, the date in gantt-chart is 1/15/2024. The format in gantt-chart is dd.MM.yyyy. Is this an error or is there a special way of generating the date to long.