Start of bars are given as a date string. The format depends on the current locale. Examples of valid date strings are
Even if several format are supported it is recommended to use all numeric dates, i.e in the form "2001-10-22".
Specifying the end position may be done in two different ways, either by the end date in the same way as for the start date. The other way is to specify the length of the activity in number of days (and fractions thereof). Examples of valid end dates are:
Please note that duration is specified as numerical values and not strings.