21 Clear days' notice

Aravind Kannan (student) (86 Points)

23 February 2009  

In the illustraion under sec 171 in Ramaiya. the following is given.

If a general meeting is to be held at 3 p.m. on 5th April, service of notice of the meeting will be deemed to have been duly effected if it had been despatched by post at any time before 3 p.m. on 13 the March. 

Thus, there is a gap of 24 days.  But, clear notice means : 21 days + 2 days + 48 hours.  Can I have it as 25 days? In such a case is the above illustration correct.

Please enlighten me.