implement create-timestamp-text function in utils package.

This is a variation on the create-timestamp-id used for generating a
timestamp-id for the Meilisearch database. This text-based timestamp takes the
form of YYYY-MM-DD_HH-MM-SS. The main intention of this function is to use is as
part of a directory name when generating a snapshot (of the website's data/DB).

src/utils.lisp

@@ -6,10 +6,7 @@
         #:xml-emitter
 	#:app-constants
 	#:storage)
-  (:export #:i18n-load
+  (:export #:request-params
-           #:_
-           #:parse-iso-date
-	   #:request-params
 	   #:string-is-nil-or-empty?
 	   #:separate-files-in-web-request
 	   #:set-alert
@@ -27,7 +24,8 @@
 	   #:build-alert-string
            #:month-number-to-name
            #:build-url-root
-           #:build-url)
+           #:build-url
+           #:create-timestamp-text)
   (:documentation "Utilities that do not depend on models."))
 
 (in-package #:utils)
@@ -171,6 +169,13 @@ to operate properly."
       (get-decoded-time)
     (format nil "~d~2,'0d~d~2,'0d~2,'0d~2,'0d" year month day hour minute second)))
 
+(defun create-timestamp-text ()
+  "Creates a text-based timestamp (value being the time function was called)."
+  (multiple-value-bind
+	(second minute hour day month year)
+      (get-decoded-time)
+    (format nil "~d-~2,'0d-~d_~2,'0d-~2,'0d-~2,'0d" year month day hour minute second)))
+
 (defun month-number-to-name (month-number)
   "Converts `MONTHS-NUMBER' to its name (E.G. 1 to 'January')."
   (cond ((= 1 month-number) "January")