input check date yyyy-mm-dd

.coffee

inpt = $ 'input.date'
inpt.on 'keypress', ( event ) =>
  key = event.key
  val = inpt.val()
  unless /^[0-9\-]$/.test( key ) or event.ctrlKey or event.keyCode > 0
    event.preventDefault()
  if /^[0-9\-]$/.test( key )
    if /^[0-9]{3}$/.test( val ) or /^[0-9]{2,4}\-[0-9]{1}$/.test( val )
      inpt.val val + key + '-'
      event.preventDefault()
  inpt.toggleClass 'error', not /^[0-9]{2,4}\-[0-9]{1,2}\-[0-9]{1,2}$/.test( val )
inpt.on 'change focusin focusout', ( event ) =>
  inpt.toggleClass 'error', not /^[0-9]{2,4}\-[0-9]{1,2}\-[0-9]{1,2}$/.test inpt.val()