This trick must be used when we need to calculate previous date from the given date.
On 15 April 1998 was Wednesday. so What was The day on 7 May 1996.
First of all we must Know:
0th odd day=Sunday
1th odd day=Monday
2th odd day=Tuesday
3th odd day=Wednesday
4th odd day=Thursday
5th odd day=Friday
6th odd day=Saturday
STEP 1 :
First of all we calculate the total number of days between the date 7 May 1996 to 15 April 1998
|Number of Days in1996|
|Number of Days in1997|
|Number of Days in1998|
|Total No. of Days||708|
STEP 2 :
Now we calculate the odd day number and for that we have to divide the total number of days with 7(1week=7days) and reminder will be our odd day number.
708 / 7 = 1 odd days (1 is Reminder)
STEP 3 :
As we know given day is Wednesday which is 3th odd day
Let the odd Number associated with the day on 7 May 1996 is 'X'
Wednesday on 15 April 1998 = 3 odd day
so 'X + 1 = 3'
Now we have to put the value of 'X' as after dividing 'X + 1' with '7' reminder will be '3'
so 'X = 2' and day is 'Tuesday'