Hi,
This could be because, you might have opted to have the small buttons on the Taskbar from its properties. If you uncheck the option to have small buttons on the Taskbar, then that would increase the taskbar size and will display the date with the time on the notification area on the taskbar. You may follow these steps:
a) Right click on the Taskbar and select “Properties”.
b) On the “Taskbar” tab, uncheck the option “Use small Taskbar buttons”.
c) Click on “Apply” and then “OK”.
d) Now check if that display the date with the time on the notification area.
Hope this is helpful.