Converting time to Minutes


R

rlm

Converting 5:08:00 using =(HOUR(D2) *60)+MINUTE(D2) works perfect.
That turns out 308 minutes.

However, converting 119:38:00 the same way doesn't work. As a matter
of fact, HOUR(XN) where the value of the cell XN = 119:38:00 returns
23. It should be 119.

How can I convert 119:38:00 to 7178 minutes?
 
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C

Claus Busch

Hi,

Am Thu, 21 Jul 2011 05:32:48 -0700 (PDT) schrieb rlm:
Converting 5:08:00 using =(HOUR(D2) *60)+MINUTE(D2) works perfect.
That turns out 308 minutes.
=D2*1440
and format General


Regards
Claus Busch
 
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J

joeu2004

rlm said:
Converting 5:08:00 using =(HOUR(D2) *60)+MINUTE(D2)
works perfect. That turns out 308 minutes.
However, converting 119:38:00 the same way doesn't work.

Claus Busch said:
Am Thu, 21 Jul 2011 05:32:48 -0700 (PDT) schrieb rlm:
=D2*1440
and format General
Although that does work by coincidence for D2 equal to 5:08:00 and
119:38:00, I would suggest the following instead:

=ROUND(D2*1440,0)

Try putting Claus's formula into D3, and put =D3-ROUND(D3,0)=0 into D4.
Then put 1:03:00 into D2. You will see that D4 is FALSE (!).

The point is: Excel time is stored as decimal fraction of a day. As with
all non-integers, the representation is usually not exact. See #2 below.

Some other details....

1. Note that I write =D3-ROUND(D3,0)=0 instead =D3=ROUND(D3,0).

The latter returns TRUE, but it is only an illusion due to the dubious
heuristic poorly described under the misleading title "Example When a Value
Reaches Zero" at http://support.microsoft.com/kb/78113. In other words,
Excel forces the latter difference to zero artificially. We cannot always
count on that.

2. I write ROUND(D3,0) instead of INT(D3).

This is because the floating-point representation of D3 when D2 is
1:03:00 is actually less than 63, namely
62.9999999999999,9289457264239899814128875732421875. As it happens, Excel
INT(D3) does return 63 for that representation. But I argue that it is a
defect. Note that VBA Int(Range("d3")) returns 62, as I would expect.
 

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