If you are one of those users who need to be always up to date and check the calendar every two by three then the austere calendar clock that comes in the Windows system tray will fall short, what you need is something like DateInTray.
DateInTray installs a small but practical clock and calendar in the Windows system tray, where it will be kept so that we know what day we are at a quick glance.
This way you will always have the most important days of each month in sight and you will be aware of the current time and day so that no holiday is caught by surprise for example.
You can free download DateInTray 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.