The latest build of Windows 10 released by Microsoft has a new clock but requires activation by users. The clock is an integral feature of all Windows versions, but it hasn't changed much since the release of Windows Vista and later.
The image below shows the differences between the old design and the new one.

As you can see, the new Windows 10 clock and calendar use larger characters and larger spaces than older versions.
However, for the clock to appear, you need to enable the new design. To do so, we need to tweak the Windows Registry a bit by hand or with commands.
Type regedit.exe in the search and open Registry Editor.
Accept the UAC window if it appears.
Go to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell
Right-click on ImmersiveShell, and select New > DWORD (32-bit) Value or New > Dword (32-bit).
Type UseWin32TrayClockExperience. The value is automatically set to 0, leave it as is.
The new clock will be available immediately after creating the new DWORD value. Click the clock in the lower right corner to see if it displays correctly.
You can revert the setting at any time by deleting the Dword you created or setting the value to 1. No system reboot is required for the change you made to take effect.
If you prefer to do the same with commands, use the following:
From the Windows 10 command line: reg add HKLM\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell /v UseWin32TrayClockExperience /t REG_DWORD /d 0
Using Powershell: new-itemproperty -Path “HKLM:\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell” -Name “UseWin32TrayClockExperience” -Type DWORD -Value 0
