You have a car made in 2012 and the last inspection was 4 April 2018. When are you required to inspect it again?
On 20 May 2018, the old system with the last digit in the registration number was discontinued.
New inspection rules as of 20 May 2018:
To simplify, a car older than 5 years must be inspected every year. It is recommended to schedule an inspection the same month every year and treat the 2 extra months as a margin of safety.
Please note that the last day for inspection is always the last day of the month. This is because you start counting the month after the most recent inspection.