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window.legalDaysPerMonth =
false: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
true: [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
window.correctDay = (dateValues) ->
[day, month, year] = dateValues
return day unless day > 0 && month > 0 && year > 0
legallyMaximumDay = legalDaysPerMonth[isLeapYear(year)][month - 1]
Math.min day, legallyMaximumDay
window.isLeapYear = (year) ->
(year % 4 == 0) && ((year % 400 == 0) || (year % 100 != 0))
window.smartCorrectDate = ->
allSelectors = $(@).parent().children('select')
allVals = allSelectors.map (index, sel) ->
parseInt($(sel).val())
correctedDay = correctDay allVals
daySelector = allSelectors.first()
$(daySelector).val(correctedDay)
$ ->
$(document).on 'change', '.smart_date select', smartCorrectDate
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