docs + preserve :CreationDate where possible

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Change Log
 
+#### Change log v.1.0.24 (2023-10-19)
+
+**Fix**: possible `nil` in loop. Credit to @jkowens for PR #231 and adding a quick fix using a simple guard.
+
+**Fix**: preserve file creation date metadata where relevant.
+
 #### Change log v.1.0.23 (2023-04-04)
 
 **Feature**: merged PR #177 for the `raise_on_encrypted: true` option support. Credit to @leviwilson and @kimyu92 for the PR.

combine_pdf.gemspec

@@ -7,7 +7,7 @@ Gem::Specification.new do |spec|
   spec.name          = "combine_pdf"
   spec.version       = CombinePDF::VERSION
   spec.authors       = ["Boaz Segev"]
-  spec.email         = ["[email protected]"]
+  spec.email         = ["[email protected]"]
   spec.summary       = %q{Combine, stamp and watermark PDF files in pure Ruby.}
   spec.description   = %q{A nifty gem, in pure Ruby, to parse PDF files and combine (merge) them with other PDF files, number the pages, watermark them or stamp them, create tables, add basic text objects etc` (all using the PDF file format).}
   spec.homepage      = "https://github.com/boazsegev/combine_pdf"

lib/combine_pdf/pdf_public.rb

@@ -175,8 +175,12 @@ def save(file_name, options = {})
     def to_pdf(options = {})
       # reset version if not specified
       @version = 1.5 if @version.to_f == 0.0
+
       # set info for merged file
-      @info[:ModDate] = @info[:CreationDate] = Time.now.strftime "D:%Y%m%d%H%M%S%:::z'00"
+      unless(@info[:CreationDate].is_a?(String))
+        @info[:CreationDate] = Time.now unless @info[:CreationDate].is_a?(Time)
+        @info[:CreationDate] = @info[:CreationDate].getgm.strftime("D:%Y%m%d%H%M%S%:::z'00")
+      end
       @info[:Subject] = options[:subject] if options[:subject]
       @info[:Producer] = options[:producer] if options[:producer]
       # rebuild_catalog

lib/combine_pdf/version.rb

@@ -1,3 +1,3 @@
 module CombinePDF
-  VERSION = '1.0.23'.freeze
+  VERSION = '1.0.24'.freeze
 end

test/automated

@@ -3,7 +3,8 @@
 $VERBOSE = true
 
 require 'benchmark'
-$LOAD_PATH.unshift File.expand_path(File.join('..', '..', 'lib'), __FILE__)
+Dir.chdir File.expand_path(File.join('..', '..', 'lib'), __FILE__)
+$LOAD_PATH.unshift Dir.pwd
 require 'combine_pdf'
 # require 'bundler/setup'