1 files changed, 38 insertions, 0 deletions
diff --git a/date-fns/src/isExists/index.ts b/date-fns/src/isExists/index.ts
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+++ b/date-fns/src/isExists/index.ts
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+/**
+ * @name isExists
+ * @category Common Helpers
+ * @summary Is the given date exists?
+ *
+ * @description
+ * Checks if the given arguments convert to an existing date.
+ *
+ * @param {Number} year of the date to check
+ * @param {Number} month of the date to check
+ * @param {Number} day of the date to check
+ * @returns {Boolean} the date exists
+ * @throws {TypeError} 3 arguments required
+ *
+ * @example
+ * // For the valid date:
+ * var result = isExists(2018, 0, 31)
+ * //=> true
+ *
+ * @example
+ * // For the invalid date:
+ * var result = isExists(2018, 1, 31)
+ * //=> false
+ */
+export default function isExists(year: number, month: number, day: number): boolean {
+  if (arguments.length < 3) {
+    throw new TypeError(
+      '3 argument required, but only ' + arguments.length + ' present'
+    )
+  }
+
+  const date = new Date(year, month, day)
+  return (
+    date.getFullYear() === year &&
+    date.getMonth() === month &&
+    date.getDate() === day
+  )
+}