Added 'publishAt' functionality, which allows you to upload a video for scheduled publishing.

'publishAt' requires 'privace' to be set to 'private'. Script does not check, whether that's the case but rather fails the upload.
Time has to be in format YYYY-MM-DDThh:mm:ss.sZ (T and Z being literals). Also, as Z indicates time is UTC-0. Consider this when using.

youtube_upload/main.py

@@ -109,6 +109,8 @@ def upload_youtube_video(youtube, options, video_path, total_videos, index):
         },
         "status": {
             "privacyStatus": options.privacy,
+            "publishAt": options.publishAt,
+
         },
         "recordingDetails": {
             "location": lib.string_to_dict(options.location),
@@ -182,6 +184,8 @@ def main(arguments):
         help='Video tags (separated by commas: "tag1, tag2,...")')
     parser.add_option('', '--privacy', dest='privacy', metavar="STRING",
         default="public", help='Privacy status (public | unlisted | private)')
+    parser.add_option('', '--publishAt', dest='publishAt', metavar="datetime",
+       default="", help='Publish Date: YYYY-MM-DDThh:mm:ss.sZ')
     parser.add_option('', '--location', dest='location', type="string",
         default=None, metavar="latitude=VAL,longitude=VAL[,altitude=VAL]",
         help='Video location"')