Number of occurences between two dates based on a starting date + frequence

I have a starting date in cell A1 and a frequency (in days) in cell B1. In cell C1 I have a date (begin) and in cell C4 I have a later date (end). I need to know how often the event occurs during the time between begin and end dates (inclusive).
For instance, the starting date is january 25th, the frequency is 5. The first date is januari 25th, the second date is februari 12th. The result should be 2 (because given the starting date and frequency of the event, it will occur in februari on day 4 and 9).
I have been looking at some of the statistical functions, but I don't think there is a function for this. Right now I have about 5 formulas to calculate intermediate results, but I'm stuck trying to combine them.
I would be happy with just a pointer in the right direction. For instance, is there a specific name for this kind of calculation?

michielvoo wrote:
I have a starting date in cell A1 and a frequency (in days) in cell B1. In cell C1 I have a date (begin) and in cell C4 I have a later date (end). I need to know how often the event occurs during the time between begin and end dates (inclusive).
For instance, the starting date is january 25th, the frequency is 5. The first date is januari 25th, the second date is februari 12th. The result should be 2 (because given the starting date and frequency of the event, it will occur in februari on day 4 and 9).
If the event occurs every five days, the second date will be January 30, and the event will occur four times " during the time between begin and end dates (inclusive)"
I have been looking at some of the statistical functions, but I don't think there is a function for this. Right now I have about 5 formulas to calculate intermediate results, but I'm stuck trying to combine them.
It's not really a statistical calculation, but a simple division to find "How many whole sets of five (days) are there in the days between two dates."
I would be happy with just a pointer in the right direction. For instance, is there a specific name for this kind of calculation?
Two functions and one operation are needed:
DATEDIF() to calculate the number of days between the start and end dates.
Division to determine how many sets of five days there are in that period.
INT() to discard the fractional part of the result.
With the values located as described, this formula (placed in a cell on the same table) will return the number of occurrences not including the first one.
=INT(DATEDIF(C1,C4,"D")/B1)
To include the Start date as one of the occurrences, make this modification:
=INT(DATEDIF(C1,C4,"D")/B1)+1
Regards,
Barry

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Number of occurences between two dates based on a starting date + frequence

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