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Treat default creation/mod dates as UTC (fixes #155)

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(Tested with Python 3.11.3 on Arch Linux.)

Without passing a tzinfo object to `datetime.now()`, a "naive" datetime
object is created, which is not timezone-aware. To fix the default
date/time detection for non-UTC local timezones, pass
`datetime.timezone.utc` to convert the value to UTC and make the
datetime object "aware".

Also, adjust the strftime() wrappers to use the UTC offsets instead of a
literal `Z`; using the literal `Z` at the end appears to be valid for
ISO 8601, but for some reason it does not successfully convert, whereas
the `%z` placeholder substitutes the UTC offset and successfully
converts.
This commit is contained in:
Patrick McCarty 2023-05-29 13:55:54 -07:00
parent 7fa67bb337
commit 1dd05cc36b
1 changed files with 4 additions and 3 deletions
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7
src/img2pdf.py
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@ -37,6 +37,7 @@ if hasattr(GifImagePlugin, "LoadingStrategy"):
# TiffImagePlugin.DEBUG = True # TiffImagePlugin.DEBUG = True
from PIL.ExifTags import TAGS from PIL.ExifTags import TAGS
from datetime import datetime from datetime import datetime
from datetime import timezone
from jp2 import parsejp2 from jp2 import parsejp2
from enum import Enum from enum import Enum
from io import BytesIO from io import BytesIO
@ -721,7 +722,7 @@ class pdfdoc(object):
self.writer.docinfo = PdfDict(indirect=True) self.writer.docinfo = PdfDict(indirect=True)
def datetime_to_pdfdate(dt): def datetime_to_pdfdate(dt):
return dt.strftime("%Y%m%d%H%M%SZ") return dt.strftime("%Y%m%d%H%M%S%z")
for k in ["Title", "Author", "Creator", "Producer", "Subject"]: for k in ["Title", "Author", "Creator", "Producer", "Subject"]:
v = locals()[k.lower()] v = locals()[k.lower()]
@ -731,7 +732,7 @@ class pdfdoc(object):
v = PdfString.encode(v) v = PdfString.encode(v)
self.writer.docinfo[getattr(PdfName, k)] = v self.writer.docinfo[getattr(PdfName, k)] = v
now = datetime.now() now = datetime.now(tz=timezone.utc)
for k in ["CreationDate", "ModDate"]: for k in ["CreationDate", "ModDate"]:
v = locals()[k.lower()] v = locals()[k.lower()]
if v is None and nodate: if v is None and nodate:
@ -751,7 +752,7 @@ class pdfdoc(object):
) )
def datetime_to_xmpdate(dt): def datetime_to_xmpdate(dt):
return dt.strftime("%Y-%m-%dT%H:%M:%SZ") return dt.strftime("%Y-%m-%dT%H:%M:%S%z")
self.xmp = b"""<?xpacket begin='\xef\xbb\xbf' id='W5M0MpCehiHzreSzNTczkc9d'?> self.xmp = b"""<?xpacket begin='\xef\xbb\xbf' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='XMP toolkit 2.9.1-13, framework 1.6'> <x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='XMP toolkit 2.9.1-13, framework 1.6'>