Thank you very very much, problem solved, now the time is within the mqtt message 
I did a “git pull origin development” and again adapted the User_config (changed NTP to my own, message_UTCtimestamp true)
{“model”:“Bresser-6in1”,“id”:1367343940,“channel”:0,“sensor_type”:1,“wind_max_m_s”:0.9,“wind_avg_m_s”:0.9,“wind_dir_deg”:60,“rain_mm”:119.6,“startup”:1,“flags”:1,“mic”:“CRC”,“protocol”:“Bresser Weather Center 6-in-1, 7-in-1 indoor, soil, new 5-in-1, 3-in-1 wind gauge, Froggit WH6000, Ventus C8488A”,“rssi”:-102,“duration”:33996,"UTCtime":“2024-08-30T12:07:11Z”}