1 files changed, 26 insertions, 0 deletions
diff --git a/app/assets/javascripts/smart_date.coffee b/app/assets/javascripts/smart_date.coffee
new file mode 100644
index 000000000..afc0c7ddf
--- /dev/null
+++ b/app/assets/javascripts/smart_date.coffee
@@ -0,0 +1,26 @@
+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.legal
+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