Fix PDF/A validation failure due to timezone being omitted from /ModDate

src/ocrmypdf/pdfa.py

@@ -129,7 +129,9 @@ def encode_pdf_date(d: datetime) -> str:
         s += "+00'00'"
     elif tz != '':
         sign, tz_hours, tz_mins = tz[0], tz[1:3], tz[3:5]
-        s += "{}{}'{tz}'".format(sign, tz_hours, tz_mins)
+        s += "{}{}'{}'".format(sign, tz_hours, tz_mins)
+    else:
+        raise ValueError("Naive timezone not supported")
     return s
 
 

src/ocrmypdf/pipeline.py

@@ -18,7 +18,7 @@
 from contextlib import suppress
 from shutil import copyfileobj
 from pathlib import Path
-from datetime import datetime
+from datetime import datetime, timezone
 import sys
 import os
 import shutil
@@ -900,7 +900,7 @@ def get_pdfmark(base_pdf, options):
         PROGRAM_NAME, VERSION,
         renderer_tag,
         tesseract.version())
-    pdfmark['/ModDate'] = encode_pdf_date(datetime.utcnow())
+    pdfmark['/ModDate'] = encode_pdf_date(datetime.now(timezone.utc))
     return pdfmark