I confess this gets me all the time - I use the clock in the footer of this forum which I guess is associated with my user's time zone (Lisbon = Greenwich Mean Time).
And so, I guess your post date is automatically translated to my users time zone.
This is what’s presented to me under your post: "DomainStation, Monday at 4:00 PM" and for your reference, it’s now 12:19 PM