I am running into an issue with the time sliders in Leaflet. It appears that most all of the sliders developed for Leaflet operate on the assumption that each record in your data layer has a specific time/date. Unfortunately, my data (historical by nature) have date ranges instead of a specific date (i.e. 1787 - 1810 as opposed to 8 August 1787). I was envisioning a time slider that could add the point to the map when the slider crosses into the items date range and then removes the point when the slider leaves the date range. Does my question make sense and if it does, how can I best address this issue?