add date humanize command (#3833)

* add `date humanize` command

* add docs

docs/commands/date-humanize.md

@@ -0,0 +1,24 @@
+# date humanize
+Print a 'humanized' format for the date, relative to now.
+
+## Usage
+```shell
+> date humanize
+ ```
+
+## Flags
+* -h, --help: Display this help message
+* -t, --table: print date in a table
+
+## Examples
+  Format the current date
+```shell
+> date now | date humanize
+ ```
+
+  Format the current date and print in a table
+```shell
+> date now | date humanize -t
+ ```
+
+