added date.year function

content/v2.0/reference/flux/functions/date/year.md

@@ -0,0 +1,29 @@
+---
+title: date.year() function
+description: >
+  The `date.year()` function returns the year of a specified time.
+menu:
+  v2_0_ref:
+    name: date.year
+    parent: Date
+weight: 301
+---
+
+The `date.year()` function returns the year of a specified time.
+
+_**Function type:** Transformation_  
+
+```js
+import "date"
+
+date.year(t: 2019-07-17T12:05:21.012Z)
+
+// Returns 2019
+```
+
+## Parameters
+
+### t
+The time to operate on.
+
+_**Data type:** Time_