After upgrading from an E license to a C1 license, which date determines the renewal deadline?

[StSara]

After upgrading from an E license to a C1 license, the renewal date is still based on the date when the E license was initially obtained, i.e., the initial issuance date. C1 Driver's License: The C1 driver's license is one of the classifications for motor vehicle driving licenses. The C1 license permits the holder to drive small and mini passenger vehicles, light and mini cargo vehicles, as well as light, small, and mini special purpose vehicles. Small passenger vehicles must accommodate 9 or fewer passengers. Age Requirements: The minimum age to apply for a C1 driver's license is 18 years old, with no upper age limit. However, applicants aged 70 or older must pass tests assessing memory, judgment, and reaction abilities.