Emacs 26.1
| | Start date | End date | State | Task | Duration (hours) |
|---+------------------------+------------------------+-------+----------+------------------|
| # | <2018-01-02 Wed 10:30> | <2018-01-02 Tue 14:00> | Taken | some url | 00:00:00 |
| # | <2018-01-02 Wed 14:00> | <2018-01-02 Wed 18:00> | Taken | some url | 00:00:00 |
| # | <2018-01-03 Wed 10:00> | <2018-01-03 Wed 12:00> | Taken | some url | 00:00:00 |
| # | <2018-01-03 Wed 14:00> | <2018-01-03 Wed 18:00> | Taken | some url | 00:00:00 |
|---+------------------------+------------------------+-------+----------+------------------|
| | | | | | 00:00:00 |
#+TBLFM: $6=60*60*24*date(<$3>)-date(<$2>);T :: @>$6 = vsum(@I..@II);T
But as you can see the last column (Duration) not calculate.
Why?