Created attachment 2114 [details] screenshots See attachment It looks like the Date column is only sorted by date, not by date and time Claws Mail 3.17.3
There is not a 3.17.3 GTK3 version. You are using threading. There is no difference between gtk2 claws date sort and gtk3 claws date sort
Sorry, my fault. Here is the information from the About box: System Information GTK+ 2.24.32 / GLib 2.58.3 Locale: en_US.UTF-8 (charset: UTF-8) Operating System: Linux 4.19.0-11-amd64 (x86_64
I have discovered the following workaround: First, the "strange" ordering apparently only happens, when the folder is newly created. Then press Ctrl-T twice (switching to Threaded View and back), and the order is fixed. After that, one can even arbitrarily alternate between ascending and descending order, everything remains fine.