On Dec 11, 2006, at 8:38 PM, Michael wrote:
On Dec 11, 2006, at 5:00 PM, Charles Yeomans wrote:
Also note that ParseDate parses dates, not dates + times. So if
you need to compare dates only, comparing TotalSeconds may not
work. For this I use the following function.
Function Equals(extends d1 as Date, d2 as Date) as Boolean
if d2 <> nil then
const SecondsInOneDay = 86400.0
return (Floor(d1.TotalSeconds/SecondsInOneDay) = Floor
(d2.TotalSeconds/SecondsInOneDay))
else
return false
end if
End Function
Charles,
So, you are simply extending the function of an object (date)
declared as d1? Or am not understanding this well...very likely. :-)
You said...."Also note that ParseDate parses dates, not dates +
times. So if you need to compare dates only, comparing
TotalSeconds may not work". Did you mean "dates with times" or did
I miss that one too...again likely?
The use of extends in the function above allows you to call it using
dot notation --
if d1.Equals(d2) then
...
A Date object stores a date and time. Many times one is interested
only in storing a date. But comparisons such as
d1.TotalSeconds = d2.TotalSeconds
or the basically undocumented d1 = d2, which appears to actually
compare TotalSeconds values, compare the date and time. To compare
dates only requires a little more work, hence the Equals function.
Charles Yeomans
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