diff --git a/youtube_dl/extractor/piapro.py b/youtube_dl/extractor/piapro.py
index 85f1b4efb..e28fcc84c 100644
--- a/youtube_dl/extractor/piapro.py
+++ b/youtube_dl/extractor/piapro.py
@@ -39,8 +39,10 @@ class PiaproIE(InfoExtractor):
         else:
             content_id = self._search_regex(r'''contentId\s*:\s*['"]([0-9a-zA-Z]+?)['\"]''', webpage, 'content_id')
 
-        create_date = self._search_regex(r'''createDate\s*:\s*['"]([0-9]{14})['"]''', webpage, 'create_date', fatal=False) or \
+        create_date_str = self._search_regex(r'''createDate\s*:\s*['"]([0-9]{14})['"]''', webpage, 'create_date', fatal=False) or \
             self._search_regex(r'''["']https?://songle\.jp/songs/piapro\.jp.*([0-9]{14})['"]''', webpage, 'create_date')
+        create_date = datetime.strptime(create_date_str, '%Y%m%d%H%M%S')
+        create_date_unix = (create_date - datetime(1970,1,1)).total_seconds()
 
         uploader = get_element_by_class("cd_user-name", webpage)
         try:
@@ -55,9 +57,9 @@ class PiaproIE(InfoExtractor):
             'description':  get_element_by_class("cd_dtl_cap", webpage),
             'id':           content_id,
             'thumbnail':    self._search_regex(r'(https?://c1\.piapro\.jp/timg/.+?_1440\.jpg)', webpage, 'thumbnail', fatal=False),
-            'timestamp':    int(datetime.strptime(create_date, '%Y%m%d%H%M%S').strftime("%s")),
+            'timestamp':    create_date_unix,
             'title':        get_element_by_class("works-title", webpage) or self._html_search_regex(r'<title>[^<]*「(.*?)」<', webpage, 'title', fatal=False),
             'uploader':     uploader_without_honorific or uploader,
             # 'uploader_url': self._search_regex(r'<a\s+.*?href="(https?://piapro\.jp/.+?)"', cls_userbar_name, 'uploader_url', fatal=False),  # FIXME
-            'url':          'http://cdn.piapro.jp/mp3_a/{}/{}_{}_audition.mp3'.format(content_id[:2], content_id, create_date)
+            'url':          'http://cdn.piapro.jp/mp3_a/{}/{}_{}_audition.mp3'.format(content_id[:2], content_id, create_date_str)
         }