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Convert creation/modification dates to UTC (fixes #155)

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Ensure that timezones are correctly interpreted in the input by calling
`.astimezone()` as appropriate on datetime objects, and store the
resulting date fields as UTC.

One could argue that datetimes in the local timezone be stored in the
PDF, but then the date string handling becomes more complicated; the PDF
and XMP date specs both use the `Z` suffix to indicate UTC time, but
other +/- offsets require different syntax between the two specs.
This commit is contained in:
Patrick McCarty 2023-06-10 17:53:03 -07:00
parent 0cbcb8fa12
commit 81502f21af
1 changed files with 4 additions and 4 deletions
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8
src/img2pdf.py
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@ -36,7 +36,7 @@ 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, 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
@ -722,7 +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.astimezone(tz=timezone.utc).strftime("%Y%m%d%H%M%SZ")
for k in ["Title", "Author", "Creator", "Producer", "Subject"]: for k in ["Title", "Author", "Creator", "Producer", "Subject"]:
v = locals()[k.lower()] v = locals()[k.lower()]
@ -732,7 +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().astimezone()
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:
@ -752,7 +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.astimezone(tz=timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
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'>