From d62006bc11e16235170e37ff5bfa139e22ec1f92 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 1 Aug 2013 08:23:06 +0530
Subject: [PATCH] QDateTime->datetime faster and more robust

Fix editing of book metadata failing when its timestamp is out of range
for the system. Fixes #1191599 [Cannot edit simple ebook metadatas](https://bugs.launchpad.net/calibre/+bug/1191599)
---
 src/calibre/utils/date.py | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/calibre/utils/date.py b/src/calibre/utils/date.py
index dc8adc6b97..a0c1c77a7a 100644
--- a/src/calibre/utils/date.py
+++ b/src/calibre/utils/date.py
@@ -7,7 +7,7 @@ __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
 import re, time
-from datetime import datetime, time as dtime, timedelta
+from datetime import datetime, time as dtime, timedelta, MINYEAR, MAXYEAR
 from functools import partial
 
 from dateutil.tz import tzlocal, tzutc, EPOCHORDINAL
@@ -141,14 +141,26 @@ def dt_factory(time_t, assume_utc=False, as_utc=True):
         dt = dt.replace(tzinfo=_utc_tz if assume_utc else _local_tz)
     return dt.astimezone(_utc_tz if as_utc else _local_tz)
 
+safeyear = lambda x: min(max(x, MINYEAR), MAXYEAR)
+
 def qt_to_dt(qdate_or_qdatetime, as_utc=True):
-    from PyQt4.Qt import Qt
     o = qdate_or_qdatetime
     if hasattr(o, 'toUTC'):
         # QDateTime
-        o = unicode(o.toUTC().toString(Qt.ISODate))
-        return parse_date(o, assume_utc=True, as_utc=as_utc)
-    dt = datetime(o.year(), o.month(), o.day()).replace(tzinfo=_local_tz)
+        o = o.toUTC()
+        d, t = o.date(), o.time()
+        try:
+            ans = datetime(safeyear(d.year()), d.month(), d.day(), t.hour(), t.minute(), t.second(), t.msec()*1000, utc_tz)
+        except ValueError:
+            ans = datetime(safeyear(d.year()), d.month(), 1, t.hour(), t.minute(), t.second(), t.msec()*1000, utc_tz)
+        if not as_utc:
+            ans = ans.astimezone(local_tz)
+        return ans
+
+    try:
+        dt = datetime(safeyear(o.year()), o.month(), o.day()).replace(tzinfo=_local_tz)
+    except ValueError:
+        dt = datetime(safeyear(o.year()), o.month(), 1).replace(tzinfo=_local_tz)
     return dt.astimezone(_utc_tz if as_utc else _local_tz)
 
 def fromtimestamp(ctime, as_utc=True):