thought she may be rostered to fly from 2200 on 7th March
Sorry to harp on, Creampuff, but your example is no in both cases purely by either interpretation of seven days. (Neglecting rosters in excess of eight hrs, multiple rosters in excess of eight hours and no consecutive days off).
By midnight to midnight definition, yes, you would breach if you started on the 7th.
By SI definition, 10pm on 7th is only the start of the sixth day. You still breach.
Bear with me.
1st 10pm to 2nd 9:59pm. 24hrs total (1 day)
2nd 10pm to 3rd 9:59pm. 48hrs total (2 days)
3rd 10pm to 4th 9:59pm. 72hrs total (3 days)
4th 10pm to 5th 9:59pm. 96hrs total (4 days)
5th 10pm to 6th 9:59pm. 120hrs total (5 days)
6th 10pm to 7th 9:59pm. 144hrs total (6 days)
7th 10pm up until 9:59pm in the
8th is still within 7 days. Bust.
I can't come up with any scenario where the SI definition is more limiting than the midnight one.
Anyone?