In Thunderbird, in the table list of emails, what does column Date mean

Hello, I face a problem with my email provider. I received an email and I can see 2 dates-hours in the emails platform of my provider (coprmail Cosmote, Athens, Greece). Specifically, 111:24 am and 12:06 pm. In Thunderbird, for the same email account, the column Date shows the value 12:06 pm. This caused other problem. In search I made, in the emails platform of my provider, for the same email, I have 11:24 am and in the preview window of the body of the email shows 12:06 pm. In my question to the provider, why this happened, I received the answer that the message received at their email server at 11:24 am, and the other date, 12:06 pm is the hour that the sender sent the email. I can understand that the PC of the sender could had wrong date+hour, but what is happend with thunderbird? So, my question to the community is: In the table list of emails in Thunderbird, the column Date what does it mean? I am waiting for receiving your reply. Yours sincerely Panagiotis Sousounis Region Of Attica Athens Greece