#### Date-Time Calculations

```I need to create a little spreadsheet to calculate dates for drug
tests.

The two inputs are (1) the date & time when the test was taken and (2)
the time period that the test covers. The output is the date when the
test coverage starts.

That's simple except that the units vary. Some tests are good for
hours and others for days. One test can detect alcohol usage for 80
hours. Another can detect drug use for 90 days.

If the test duration units are hours, something like this will work:

A                        B                           C   D   E
1   7/08/08 9:15 am    Timestamp when test was taken
2                80    Test duration (hours)
3   5/05/08 1:15 am    Timestamp when test coverage begins

A1 & A3 are formatted as date & time.

The formula in A3 is "=B3-(B4/24)".

I would appreciate suggestions for a way to put a value in A2 that can
be in hours or days and maybe in months.

My alternative would be to create two tables in the same spreadsheet:
one for hours and one for days.

Thanks
```
 0
7/14/2008 5:57:56 PM
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```On Mon, 14 Jul 2008 10:57:56 -0700, Three Lefts
<spamtrap@spamtrap.invalid> wrote:

>I need to create a little spreadsheet to calculate dates for drug
>tests.
>
>The two inputs are (1) the date & time when the test was taken and (2)
>the time period that the test covers. The output is the date when the
>test coverage starts.
>
>That's simple except that the units vary. Some tests are good for
>hours and others for days. One test can detect alcohol usage for 80
>hours. Another can detect drug use for 90 days.
>
>If the test duration units are hours, something like this will work:
>
>        A                        B                           C   D   E
>1   7/08/08 9:15 am    Timestamp when test was taken
>2                80    Test duration (hours)
>3   5/05/08 1:15 am    Timestamp when test coverage begins
>
>A1 & A3 are formatted as date & time.
>
>The formula in A3 is "=B3-(B4/24)".
>
>I would appreciate suggestions for a way to put a value in A2 that can
>be in hours or days and maybe in months.
>
>My alternative would be to create two tables in the same spreadsheet:
>one for hours and one for days.
>
>Thanks

After a bit of experimenting, I came up with a nested IF statement to
handle hours and days:

=IF(C6="Hours",B6/24,IF(C6="Days",B6,"Invalid"))

I have the value in B6 and the units in C6.

This formula is in B7 and converts the B6 value to days.

If I want to add months, I can add one more level of nested IFs.

It seems to work. It does require that I spell Hours and Days
correctly.

Is there a better way?

Is there an easy way to turn C6 into some sort of lookup cell that
will only accept certain values (like a lookup field in Access) and
then assign a corresponding value to the cell?

I could then define 2 values: Hours (=1/24) and Days (=1).
```
 0
7/14/2008 7:22:32 PM
```If you used LOWER(LEFT(C6,1)) as your comparator then you would only
need to check for "h" (hours), "d" (days), "m" (months) etc, so it
would not matter if you entered hrs, hours, Hours, HOURS, hour etc.

If you want to restrict the user to a pre-set list of acceptable
values, then use Data | Validation on the cell. Here's a good
reference source:

http://www.contextures.com/xlDataVal01.html

Hope this helps.

Pete

On Jul 14, 8:22=A0pm, Three Lefts <spamt...@spamtrap.invalid> wrote:
> On Mon, 14 Jul 2008 10:57:56 -0700, Three Lefts
>
>
>
>
>
> <spamt...@spamtrap.invalid> wrote:
> >I need to create a little spreadsheet to calculate dates for drug
> >tests.
>
> >The two inputs are (1) the date & time when the test was taken and (2)
> >the time period that the test covers. The output is the date when the
> >test coverage starts.
>
> >That's simple except that the units vary. Some tests are good for
> >hours and others for days. One test can detect alcohol usage for 80
> >hours. Another can detect drug use for 90 days.
>
> >If the test duration units are hours, something like this will work:
>
> > =A0 =A0 =A0 =A0A =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0B =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 C =A0 D =A0 E
> >1 =A0 7/08/08 9:15 am =A0 =A0Timestamp when test was taken
> >2 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A080 =A0 =A0Test duration (hours)
> >3 =A0 5/05/08 1:15 am =A0 =A0Timestamp when test coverage begins
>
> >A1 & A3 are formatted as date & time.
>
> >The formula in A3 is "=3DB3-(B4/24)".
>
> >I would appreciate suggestions for a way to put a value in A2 that can
> >be in hours or days and maybe in months.
>
> >My alternative would be to create two tables in the same spreadsheet:
> >one for hours and one for days.
>
> >Thanks
>
> After a bit of experimenting, I came up with a nested IF statement to
> handle hours and days:
>
> =A0 =3DIF(C6=3D"Hours",B6/24,IF(C6=3D"Days",B6,"Invalid"))
>
> I have the value in B6 and the units in C6.
>
> This formula is in B7 and converts the B6 value to days.
>
> If I want to add months, I can add one more level of nested IFs.
>
> It seems to work. It does require that I spell Hours and Days
> correctly.
>
> Is there a better way?
>
> Is there an easy way to turn C6 into some sort of lookup cell that
> will only accept certain values (like a lookup field in Access) and
> then assign a corresponding value to the cell?
>
> I could then define 2 values: Hours (=3D1/24) and Days (=3D1).- Hide quot=
ed text -
>
> - Show quoted text -

```
 0
pashurst (2576)
7/14/2008 8:52:49 PM
```On Mon, 14 Jul 2008 13:52:49 -0700 (PDT), Pete_UK
<pashurst@auditel.net> wrote:

>If you used LOWER(LEFT(C6,1)) as your comparator then you would only
>need to check for "h" (hours), "d" (days), "m" (months) etc, so it
>would not matter if you entered hrs, hours, Hours, HOURS, hour etc.
>
>If you want to restrict the user to a pre-set list of acceptable
>values, then use Data | Validation on the cell. Here's a good
>reference source:
>
>http://www.contextures.com/xlDataVal01.html

Thanks for the tip & the link.

Do you know why the data validation feature requires a range
specification for numeric data? It seems to me that it would be useful
to be able to limit a cell to any whole number. That is, in addition
to the current options (between, not between, greater than, etc.), I
would think that "Any" would be a useful option.
```
 0
7/15/2008 5:11:20 AM
```You could use Custom with a formula of

=IF(ISNUMBER(G1),IF(G1=INT(G1),TRUE))

where G1 is the DV cell

--
__________________________________
HTH

Bob

"Three Lefts" <spamtrap@spamtrap.invalid> wrote in message
news:d7co749jil63bstuijh3fu6olm2363v2eu@4ax.com...
> On Mon, 14 Jul 2008 13:52:49 -0700 (PDT), Pete_UK
> <pashurst@auditel.net> wrote:
>
>>If you used LOWER(LEFT(C6,1)) as your comparator then you would only
>>need to check for "h" (hours), "d" (days), "m" (months) etc, so it
>>would not matter if you entered hrs, hours, Hours, HOURS, hour etc.
>>
>>If you want to restrict the user to a pre-set list of acceptable
>>values, then use Data | Validation on the cell. Here's a good
>>reference source:
>>
>>http://www.contextures.com/xlDataVal01.html
>
> Thanks for the tip & the link.
>
> Do you know why the data validation feature requires a range
> specification for numeric data? It seems to me that it would be useful
> to be able to limit a cell to any whole number. That is, in addition
> to the current options (between, not between, greater than, etc.), I
> would think that "Any" would be a useful option.

```
 0
BobNGs (423)
7/15/2008 7:39:39 AM

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