Launcher version: 1.5.146096
Game version: 1.96.146114
The incorrect weekday is displayed in the editor. The displayed weekday is one day ahead of the real weekday on the same date. Playing the mission and viewing a diary record will display the correct date.
Example: [[ https://www.timeanddate.com/calendar/monthly.html?year=2020&month=1 | 2020-01-15 ]] (today's date at time of writing) is a Wednesday but is in the eden editor displayed as a Thursday.