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diff --git a/date-fns/src/isToday/index.ts b/date-fns/src/isToday/index.ts
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+import isSameDay from '../isSameDay/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @name isToday
+ * @category Day Helpers
+ * @summary Is the given date today?
+ * @pure false
+ *
+ * @description
+ * Is the given date today?
+ *
+ * > ⚠️ Please note that this function is not present in the FP submodule as
+ * > it uses `Date.now()` internally hence impure and can't be safely curried.
+ *
+ * ### v2.0.0 breaking changes:
+ *
+ * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
+ *
+ * @param {Date|Number} date - the date to check
+ * @returns {Boolean} the date is today
+ * @throws {TypeError} 1 argument required
+ *
+ * @example
+ * // If today is 6 October 2014, is 6 October 14:00:00 today?
+ * var result = isToday(new Date(2014, 9, 6, 14, 0))
+ * //=> true
+ */
+export default function isToday(dirtyDate: Date | number): boolean {
+  requiredArgs(1, arguments)
+
+  return isSameDay(dirtyDate, Date.now())
+}