First off. Thanks for timeline. I had been using another program that hadn't been updated since 2013. Timeline is a great balance between simplicity and flexibility. My feature request is this. Just as some people will want to have the work week start on Monday (which I read I can specify in general preferences) some may want to have a work month that is different from the calendar month. My client starts the work week on Mondays and depending on the start/end of the month will have a 4 or 5 week billing "month". If, in addition to "today", "this week" and "this month" I could have a "custom" time period summary in the menu drop down that would be great. The custom time period could be set in the calendar in the application window, the same way that one specifies a range for exporting timings to a CSV. This would require a couple of changes to the calendar, 1) allow for specifying a range that goes past the current day and 2) showing at least the first week of the next month in the calendar.