On 11/14/2013 12:26 PM, Bart wrote:
On 11/14/13, waldo kitty <wkitt...@windstream.net> wrote:

you are completely right, IMHO... one simply needs to choose their desired
base and level of error that is acceptable for their task's needs...

It's all about definition.

right... that's what i meant by "desired base"... eg: calendar, SI notation, Julian, Gregorian, etc...)

For me I would think that given "today" is the last day of a given
month, then "today" + 1 month = the same date on in the next month,

agreed...

or if the next month has fewer day, the last day of the next month.

yeah... i'm undecided on that :? (** below) my current code returns the 
following...

2012-01-29 to 2012-02-29 is 0 yrs 1 mos 0 days
2012-01-29 to 2012-03-01 is 0 yrs 1 mos 3 days
2012-01-29 to 2012-03-31 is 0 yrs 2 mos 2 days
2012-01-29 to 2012-04-30 is 0 yrs 3 mos 1 days
2012-01-29 to 2012-05-31 is 0 yrs 4 mos 2 days
2012-01-29 to 2012-06-30 is 0 yrs 5 mos 1 days
2012-01-29 to 2012-07-31 is 0 yrs 6 mos 2 days
2012-01-29 to 2012-08-31 is 0 yrs 7 mos 2 days
2012-01-29 to 2012-09-30 is 0 yrs 8 mos 1 days
2012-01-29 to 2012-10-31 is 0 yrs 9 mos 2 days
2012-01-29 to 2012-11-30 is 0 yrs 10 mos 1 days
2012-01-29 to 2012-12-31 is 0 yrs 11 mos 2 days

2012-01-31 to 2012-02-29 is 0 yrs 0 mos 29 days**
2012-01-31 to 2012-03-01 is 0 yrs 1 mos 1 days
2012-01-31 to 2012-03-31 is 0 yrs 2 mos 0 days
2012-01-31 to 2012-04-30 is 0 yrs 2 mos 30 days**
2012-01-31 to 2012-05-31 is 0 yrs 4 mos 0 days
2012-01-31 to 2012-06-30 is 0 yrs 4 mos 30 days**
2012-01-31 to 2012-07-31 is 0 yrs 6 mos 0 days
2012-01-31 to 2012-08-31 is 0 yrs 7 mos 0 days
2012-01-31 to 2012-09-30 is 0 yrs 7 mos 30 days**
2012-01-31 to 2012-10-31 is 0 yrs 9 mos 0 days
2012-01-31 to 2012-11-30 is 0 yrs 9 mos 30 days**
2012-01-31 to 2012-12-31 is 0 yrs 11 mos 0 days

So
- april 30th + 1 month = may 30th
- march 31st + 1 month = may 30th (not june 1st)
Yet all of our "tools" (includimg mine) say march 31st to april 30th =
0 months + 30 days...

i know what you mean ;) :)

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