No your right.
Time trials last for 14 days, they are replaced every 2 weeks.
A-spec and B-spec swap over but 1 is released every 14 days from the last one.
Or
The next B-spec is released the 25th.
The next A-spec is released the 9th.
Then B-spec on the 23rd .
( USA dates used for example. )
Unless PD want to change it due to GT academy starting in may.