09:00
10:00
11:00
12:00
now
registration time
09:05
10:05
11:05
12:05
now
validity time
version 1 from registration 09:00,
validity 09:05
version 2 from registration 10:00,
validity 10:05
version 3 from registraton 11:00,
validity 11:05
version 4 - last known