We can customize the clock style on the lock screen of the Xiaomi device. By default, the clock is displayed with the date centered. We can set whether the clock and date are left-aligned, or vertically.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Always-on display & Lock screen
Step 3:  Tap on  Lock screen clock format
Step 4:  Choose a  clock layout
Step 5:  Tap on  Back
  1. Open the Settings
  2. Tap on Always-on display & Lock screen
  3. Tap on Lock screen clock format
  4. Choose a clock layout
  5. Tap on Back

Xiaomi Instructions