Fix timestamptz binary tests with seconds in the timezone on Python 3.6

diff --git a/tests/types/test_date.py b/tests/types/test_date.py
index d37bb85aee3282ac421a8b816038dc67096d7c2b..3916020866e51534f8ba467ad8c93388c2339a91 100644 (file)
--- a/tests/types/test_date.py
+++ b/tests/types/test_date.py
@@ -273,7 +273,7 @@ def test_load_datetimetz_binary(conn, val, expr, timezone):
     cur = conn.cursor(binary=True)
     cur.execute(f"set timezone to '{timezone}'")
     cur.execute(f"select '{expr}'::timestamptz")
-    assert cur.fetchone()[0] == as_dt(val)
+    assert cur.fetchone()[0] == as_utc_dt(val)
 
 
 @pytest.mark.xfail  # parse timezone names
@@ -577,36 +577,58 @@ def as_time(s):
     return rv
 
 
+# Note: as_dt and as_utc_dt return the same timestamp, the first in a specified
+# timezone, the second in utc. However on Python < 3.7 there can't be seconds
+# in the timezone offset, so the result might be wrong up to 30 seconds.
+
+
 def as_dt(s):
-    if "~" in s:
-        s, off = s.split("~")
-    else:
-        off = None
+    if "~" not in s:
+        return as_naive_dt(s)
+
+    s, off = s.split("~")
+    rv = as_naive_dt(s)
+    rv = rv.replace(tzinfo=as_tzinfo(off))
+    return rv
 
+
+def as_utc_dt(s):
+    if "~" not in s:
+        return as_naive_dt(s)
+
+    s, off = s.split("~")
+    rv = as_naive_dt(s)
+    off = as_tzoffset(off)
+    rv = (rv - off).replace(tzinfo=dt.timezone.utc)
+    return rv
+
+
+def as_naive_dt(s):
     if "," in s:
         rv = dt.datetime(*map(int, s.split(",")))
     else:
         rv = getattr(dt.datetime, s)
 
-    if off:
-        rv = rv.replace(tzinfo=as_tzinfo(off))
-
     return rv
 
 
-def as_tzinfo(s):
+def as_tzoffset(s):
     if s.startswith("-"):
         mul = -1
         s = s[1:]
     else:
         mul = 1
 
+    fields = ("hours", "minutes", "seconds")
+    return mul * dt.timedelta(**dict(zip(fields, map(int, s.split(":")))))
+
+
+def as_tzinfo(s):
+    off = as_tzoffset(s)
     if sys.version_info < (3, 7):
-        fields = ("hours", "minutes")
-    else:
-        fields = ("hours", "minutes", "seconds")
-    tzoff = mul * dt.timedelta(**dict(zip(fields, map(int, s.split(":")))))
-    return dt.timezone(tzoff)
+        off = dt.timedelta(seconds=round(off.total_seconds() // 60) * 60)
+
+    return dt.timezone(off)
 
 
 def as_td(s):