[phpOpenTracker-User] FAQ entry fro using range

I am having trouble understanding the documentation when it comes to 
using ranges in the API. The docs say:

"In addition to the above values for the range parameter you may use the 
following interval identifiers:

     * minute
     * hour
     * day
     * month
     * year

These generic interval identifiers require two additional parameters, 
range_start and range_length, and allow to specify timeranges that start 
at current time - (range_start * length(range)) have a length of 
range_length * length(range)."


For the calculation current time - (range_start * length(range)) I am 
assuming that the current time is given in the same time units as the range?

If I wanted to get the top 3 requested documents for the three days from 
January 01, 2003 to January 03, 2003 how would I calculate the 
range_start? Would it be:

number of days from January 01, 2003 to current time?

What are the advantages to using this way of setting range parameters 
versus just using the 'start' and 'end' timestamps? Having to calculate 
the number of time units from a given point in time to now seems a bit 
awkward.

Thanks :)

Jean-Christian Imbeault



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