parse dates into datetimes

This makes it so nu treats the dates as actual dates, and displays them accordingly.

git/git_branch_age.nu

@@ -1,6 +1,15 @@
 # Creates a table listing the branches of a git repository and the day of the last commit
-git branch | lines | str substring 2, | wrap name | insert "last commit" {
-    get name | each {
-        git show $it --no-patch --format=%as
-    }
-} | sort-by "last commit"
+def "git age" [] {
+    git branch |
+    lines |
+    str substring 2, |
+    wrap name |
+    insert date {
+        get name |
+        each {
+            git show $it --no-patch --format=%as | str to-datetime
+        }
+    } |
+    sort-by date
+}
+