Bootstrap DatePicker, how to set the start date for tomorrow?

If you are using bootstrap-datepicker you may use this style:

$('#datepicker').datepicker('setStartDate', "01-01-1900");

If you are talking about Datepicker for bootstrap, you set the start date (the min date) by using the following:

$('#datepicker').datepicker('setStartDate', <DATETIME STRING HERE>);

There is no official datepicker for bootstrap; as such, you should explicitly state which one you're using.

If you're using eternicode/bootstrap-datepicker, there's a startDate option. As discussed directly under the Options section in the README:

All options that take a "Date" can handle a Date object; a String formatted according to the given format; or a timedelta relative to today, eg '-1d', '+6m +1y', etc, where valid units are 'd' (day), 'w' (week), 'm' (month), and 'y' (year).

So you would do:

$('#datepicker').datepicker({
    startDate: '+1d'
})