determining number of hours between two times

i have the following start date and end date variables in a form:
 
startdatemonth - (values are 1-12)
startdateday - (values are 1-31..depeding upon the month)
startdateyear - (values are 2004 - 2010)
starttimehour - (values are 6, 6.5, 7, 7.5, 8, 8.5, etc.)
starttimeamorpm - (values are am/pm)

ex. 3/26/2004 8.5 am

enddatemonth - (values are 1-12)
enddateday - (values are 1-31..depeding upon the month)
enddateyear - (values are 2004 - 2010)
endtimehour - (values are 6, 6.5, 7, 7.5, 8, 8.5, etc.)
endtimeamorpm - (values are am/pm)

ex. 3/26/2004 5 pm

i basically want to determine the number of hours in between these two dates.

so for above example it should be 8.5 hours (where 8.5 above means 8:30)

how to do this?

Judy DeoAsked:
Who is Participating?
 
MauseConnect With a Mentor Commented:
Hi

As Tacobell said you can use datediff to get the hours between the 2 dates.
But I gues yor problem is how to get the 8.5 to 8.30 or 20.30??
How do the users fill in the hours? width a textbox or a dropdown?
If its a dropdown its easy it will be:
<select name="starttimehour">
<option value="1,0">1</option>
<option value="'1','30'">1.5</option>
<option value="'2','0'">2</option>
<option value="'2','30'">2.5</option>
.
.
<option value="'13','0'">1</option>
<option value="'13','30'">1.5</option>
.
.
</select>

Then you can use createdatetime(startdateyear, startdatemonth, startdateday, starttimehour, "0")
AND
datediff("h",  createdatetime(startdateyear, startdatemonth, startdateday, starttimehour, "0"),  createdatetime(enddateyear, enddatemonth, enddateday, endtimehour, "0"))
to get the hours between the 2 dates

let us know
Mause
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Tacobell777Commented:
You need to use dateDiff("h", yourdate1here, yourdate2here)
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Judy DeoAuthor Commented:
but in what format should "yourdate1here" and  "yourdate2here" be? will it let me include the time part (i.e 7:30 am) ?
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Tacobell777Connect With a Mentor Commented:
yes it will let you include the time, I should have said yourdatetimehere, it needs to be a valid date and time though.
If you look at the CF documentation and look up createdatetime(), it expects variables like so createDateTime(year, month, day, hour, minute, second)
Or string createDateTime("2004", "3", "26", "9", "20", "0")
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Judy DeoAuthor Commented:
thanks.
i forgot to ask one thing about the DateDiff function. i will ask it another question.
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