This helper template calculates periods for Swedish certifications, as stated in [1] and [2]
It returns:
| Before October 1996
|
Before 2002
|
Before July 2003
|
Before November 2006
|
Before 2010
|
Before 2018
|
Before 2024
|
From 2024
|
| 1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
Returns 0 if the data provided is not sufficient.
