Great work with the new functions allowing time calculations in the spreadsheet! Just a few remarks.. The default format is MM:SS and hours have to be qualified by using three positions HH:MM:SS.

Would it not be smart if the default for this calculations is the same as the time-format for the clock table? There the default is HH:MM - i presume due to the superfluity of seconds.

I do not really care which format is the default but being able to use the time calculation on my org-mode-generated time-table, without having to manually add :SS to each string, would be great..

And another question, negative time? I realize that this sounds strange from a philosophical point of view... but being able to use minus in time-cells would be neat.

As an example i've attached a dummy-timetable to this mail to illustrate my point. Column 6 and Row 2, column 5 & 6 is generated by the time-function.

Clock summary at [2011-07-09 Sat 11:50]

|--------------+----------+--------+--------+--------+---------|

| *Total time* | *359:50* | | 10 | -285 | 2:13 |

|--------------+----------+--------+--------+--------+---------|

| Project 1 | 287:55 | | 05:00 | | 0 |

| Task 1 | | 239:50 | | 10:00 | 4:09:50 |

| Task 2 | | 48:05 | | -300 | 43:05 |

| Project 2 | 71:55 | | 05:00 | | 0 |

| Task 1 | | 47:50 | | 10:00 | 57:50 |

| Task 2 | | 24:05 | | -5:00 | 29:05 |

#+TBLFM: $6=$3+$5;T::@2$4='(apply '+ '(@3..@8));T::@2$5=vsum(@3..@8);T::@2$6=vsum(@3..@8);T