This is a hex bin implementation of leaflet + d3 + nouislider, using vanilla JavaScript with ECM 2016 web standards, so Internet Explorer is not supported.
Leaflet + d3 plugin from: https://github.com/Asymmetrik/leaflet-d3
Timeslider from: https://refreshless.com/nouislider/
Takes in spatial-temporal point data from a geojson and converts it to a hex representation with start and end dates being scrollable.
git clone https://github.com/albertkun/leaflet_hex_timeslider.git
A geojson is used for the data, and it should be formatted with a features.geometry.coordinates[] array, as per GeoJSON standards: https://en.wikipedia.org/wiki/GeoJSON
The dates should be stored under the properties object, as per GeoJSON standards above, the field used is Date (case sentitive), with date format of 1/1/2020 or any other ISO standard.
ex. json = features.properties.date