Greetings again. Answering my own question, the following seems to work (15 min is 1/96 of a day):
| time | event | |------------------------+-------| | <2015-12-07 Mon 12:00> | A | | <2015-12-07 Mon 12:15> | B | | <2015-12-07 Mon 12:30> | C | #+TBLFM: @3$1..@4$1=(<@-1>+(1.0 / 96)) Jarmo
