The golden age of dieting for women after their period

I heard that the time right after your period ends is the golden time for dieting.

Would it be good to start a diet right after my period has completely ended?

Or is the time around when my period is ending (when there is still a little blood but not much) also a golden time for dieting?

If I drastically reduce my food intake and significantly increase my activity level right after my period, will I lose weight rapidly in a short period of time?