diff --git a/warcprox/dedup.py b/warcprox/dedup.py
index 0e09239..ce1ab1f 100644
--- a/warcprox/dedup.py
+++ b/warcprox/dedup.py
@@ -500,7 +500,7 @@ class TroughDedupDb(DedupDb, DedupableMixin):
     SCHEMA_SQL = ('create table dedup (\n'
                   '    digest_key varchar(100) primary key,\n'
                   '    url varchar(2100) not null,\n'
-                  '    date datetime not null,\n'
+                  '    date varchar(100) not null,\n'
                   '    id varchar(100));\n') # warc record id
     WRITE_SQL_TMPL = ('insert or ignore into dedup\n'
                       '(digest_key, url, date, id)\n'