BigML expands your date-time fields into several individual numeric units so that they can be used as input and as the objective field for your Machine Learning models. This type of field can be expanded into up to eight fields:
- Year
- Month
- Day
- Day of the week
- Hour
- Minute
- Second
- Millisecond
You can avoid this automatic expansion through the BigML API by setting the "disable_datetime" argument as "true", or thru the Dashboard from the source configuration panel, as seen below:
You can also use the BigML Flatline editor for the same purpose. Please visit this other question to see an example or read the full reference here.