I am wondering if i can use dhtmlxScheuler for building something like this timeline:
almende.github.io/chap-links-lib … basis.html
The point is that somebody specifies at what time he will for example be available to meet other people and i do not need an end date.
May i get a response ? 
It possible to show events without end dates
You can attach event handler to onEventLoading action, and set some fake end dates ( start date + 1 day for example ) for events without end_date
The look of time scale will differ from the one on the above image of course
It is time to upgrade dhtmlx