While we are on the topic of dates, I've been thinking about creating
a "countdown" calendar, clocking the number of days remaining between
today's date and some future date (March 31, 20010 specifically).
Any tips on how I can do this? Do I have to convert dates into
seconds in order to subtract one from the other? Thanks.
On Oct 27, 2006, at 9:49 AM, Ken Ray wrote:
On 10/27/06 7:52 AM, "Mark Powell" <[EMAIL PROTECTED]> wrote:
I have a user-specified date. I want to convert it to seconds and
factor in 86400 to establish the range of seconds for that date,
so that
I can compare a file's creation date to determine whether that
file was
created on that specified day. The problem is I am not sure what is
used as the starting point for a date's seconds counter. At 6:42
this
morning, I ran this:
put the short date into theDate
convert theDate to seconds
put ((the seconds - theDate) / 3600)
and got 4.710556, which suggests that a date starts at 1:00 AM and
not
midnight. Is this accurate? And more importantly, is this the
way the
computation would be handled on any client machine anywhere?
Welcome to the wonderful world of dates in Revolution!
;-)
Seriously - Many of us have struggled with date arithmetic in Rev
as it
relates to other parts of the world. The short answer is "no", it
is not
always 1:00 AM everywhere when you convert a date to seconds and
back again.
In fact for me, I get 2:00 AM.
Date conversions give you different results depending on a number of
factors: is Daylight Saving Time (DST) or Summer Hours currently being
observed? What hemisphere are you on? Are you looking at a date
that is
"across" a DST boundary (such as the current date being in March
and you're
looking at a date in May, which is across the DST "boundary" in
April).
I wish it were easier, but it's not... in your *specific* application,
though, if you're just trying to compare one date to another, you
can strip
off the time from the file creation date, and then convert the user-
entered
date and the date from the file creation to seconds and compare - they
should be the same:
put fld "UserDate" into tUserDate
put fld "FileCreationDateTime" into tFileDateTime
put word 1 of tFileDateTime into tFileDate
-- assumes a datetime where the date and time are separate by a
space
convert tUserDate to seconds
convert tFileDate to seconds
if tUserDate = tFileDate then
answer "Same day"
else
answer "Different day"
end if
Will this work for you?
Ken Ray
Sons of Thunder Software, Inc.
Web site: http://www.sonsothunder.com/
Email: [EMAIL PROTECTED]
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