[O] Conditional in table formula with times

[Loris Bennett]

Hi,

I'm trying to keep track of total time spend at work, but I am having
trouble with a conditional in table formula:

| *Day*            | *Came* | *Went* | *Worked* | *Required* |   *Diff* |
|------------------+--------+--------+----------+------------+----------|
| [2014-01-06 Mon] |   8:00 |  17:00 | 09:00:00 |   00:00:00 | 09:00:00 |
| [2014-01-07 Tue] |        |        | 00:00:00 |   00:00:00 | 00:00:00 |
| [2014-01-08 Wed] |   8:10 |  16:30 | 08:20:00 |   00:00:00 | 08:20:00 |
| [2014-01-09 Thu] |   7:55 |  17:05 | 09:10:00 |   00:00:00 | 09:10:00 |
| [2014-01-10 Fri] |   8:00 |  17:05 | 09:05:00 |   00:00:00 | 09:05:00 |
#+TBLFM: $4=$3-$2;T::$5=if($4 > 0,"8:18:00","00:00:00");T::$6=$4-$5;T

Debugging the formula gives me for @2$5:

,---------------------------------------------
| Substitution history of formula
| Orig:   if($4 > 0,"8:18:00","00:00:00");T
| $xyz->  if($4 > 0,"8:18:00","00:00:00")
| @r$c->  if($4 > 0,"8:18:00","00:00:00")
| $1->    if((32400) > 0,"8:18:00","00:00:00")
| Result: 00:00:00
| Format: NONE
| Final:  00:00:00
`---------------------------------------------

and for @3$5:

,------------------------------------------
| Substitution history of formula
| Orig:   if($4 > 0,"8:18:00","00:00:00");T
| $xyz->  if($4 > 0,"8:18:00","00:00:00")
| @r$c->  if($4 > 0,"8:18:00","00:00:00")
| $1->    if((0) > 0,"8:18:00","00:00:00")
| Result: 00:00:00
| Format: NONE
| Final:  00:00:00
`------------------------------------------

Can anyone enlighten me as to why I get "00:00:00" in the first case?

Cheers,

Loris

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