Consider the local tz when creating a datetime object from timestamp

Otherwise datetime.fromtimestamp will return a naive datetime in the
local timezone and applying timezone modifications later with TIMEZONE
and TO_TIMEZONE won't do the right thing.

Parsing a unix timestamp value should always result in the exact same
instant in time regardless of current time zone, so it shouldn't matter
what the current TIMEZONE setting is, whether 'UTC', 'local', any other
timezone, or even unset.

dateparser/date.py

@@ -4,6 +4,7 @@
 from datetime import datetime, timedelta
 
 import regex as re
+from tzlocal import get_localzone
 from dateutil.relativedelta import relativedelta
 
 from dateparser.date_parser import date_parser
@@ -13,7 +14,8 @@
 from dateparser.parser import _parse_absolute, _parse_nospaces
 from dateparser.timezone_parser import pop_tz_offset_from_string
 from dateparser.utils import apply_timezone_from_settings, \
-    set_correct_day_from_settings
+    set_correct_day_from_settings, \
+    get_timezone_from_tz_string
 
 APOSTROPHE_LOOK_ALIKE_CHARS = [
     '\N{RIGHT SINGLE QUOTATION MARK}',     # '\u2019'
@@ -114,11 +116,18 @@ def sanitize_date(date_string):
 def get_date_from_timestamp(date_string, settings):
     match = RE_SEARCH_TIMESTAMP.search(date_string)
     if match:
+        if settings is not None and settings.TIMEZONE is not None and 'local' not in settings.TIMEZONE.lower():
+            local_timezone = get_timezone_from_tz_string(settings.TIMEZONE)
+        else:
+            local_timezone = get_localzone()
+
         seconds = int(match.group(1))
         millis = int(match.group(2) or 0)
         micros = int(match.group(3) or 0)
-        date_obj = datetime.fromtimestamp(seconds)
-        date_obj = date_obj.replace(microsecond=millis * 1000 + micros)
+        date_obj = (datetime
+                    .fromtimestamp(seconds, local_timezone)
+                    .replace(microsecond=millis * 1000 + micros, tzinfo=None)
+                    )
         date_obj = apply_timezone_from_settings(date_obj, settings)
         return date_obj
 

dateparser/utils/__init__.py

@@ -65,22 +65,23 @@ def _get_missing_parts(fmt):
     return missing
 
 
-def localize_timezone(date_time, tz_string):
-    if date_time.tzinfo:
-        return date_time
-
-    tz = None
-
+def get_timezone_from_tz_string(tz_string):
     try:
-        tz = timezone(tz_string)
+        return timezone(tz_string)
     except UnknownTimeZoneError as e:
         for name, info in _tz_offsets:
             if info['regex'].search(' %s' % tz_string):
-                tz = StaticTzInfo(name, info['offset'])
-                break
+                return StaticTzInfo(name, info['offset'])
         else:
             raise e
 
+
+def localize_timezone(date_time, tz_string):
+    if date_time.tzinfo:
+        return date_time
+
+    tz = get_timezone_from_tz_string(tz_string)
+
     if hasattr(tz, 'localize'):
         date_time = tz.localize(date_time)
     else: