Sorting table with JS plugin causes bug

It's sorted in alphabetic order. because german date format can't be parsed by javascript Date.parse. You should add custom type.

Here’s how Sortable internally sets up the defaults.

sortable.setupTypes [{
  name: 'numeric'
  defaultSortDirection: 'descending'
  match: (a) -> a.match numberRegExp
  comparator: (a) -> parseFloat(a.replace(/[^0-9.-]/g, ''), 10) or 0
}, {
  name: 'date'
  defaultSortDirection: 'ascending'
  reverse: true
  match: (a) -> not isNaN Date.parse a
  comparator: (a) -> Date.parse(a) or 0
}, {
  name: 'alpha'
  defaultSortDirection: 'ascending'
  match: -> true
  compare: (a, b) -> a.localeCompare b
}]

note match and comparator of date type. change those to:

  match: (a) -> not isNaN Date.parse a.split('.').reverse().join('.')
  comparator: (a) -> Date.parse(a.split('.').reverse().join('.')) or 0

and add these after sortable.init() call.

By the way, this is coffeescript. so use it accordingly.