[feat] plugins: add new time/timezone search plugin

The plugin uses the ``GeoLocation`` class, which is already implemented in the
context of weather forecasts, to determine the time zone. The ``DateTime`` class
is used for the localized display of date and time.

Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>

searx/plugins/time_zone.py

@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
+
+from __future__ import annotations
+import typing as t
+
+import datetime
+
+from flask_babel import gettext  # type: ignore
+from searx.result_types import EngineResults
+from searx.weather import DateTime, GeoLocation
+
+from . import Plugin, PluginInfo
+
+if t.TYPE_CHECKING:
+    from searx.search import SearchWithPlugins
+    from searx.extended_types import SXNG_Request
+    from searx.plugins import PluginCfg
+
+
+@t.final
+class SXNGPlugin(Plugin):
+    """Plugin to display the current time at different timezones (usually the
+    query city)."""
+
+    id: str = "time_zone"
+    keywords: list[str] = ["time", "timezone", "now", "clock", "timezones"]
+
+    def __init__(self, plg_cfg: "PluginCfg"):
+        super().__init__(plg_cfg)
+
+        self.info = PluginInfo(
+            id=self.id,
+            name=gettext("Timezones plugin"),
+            description=gettext("Display the current time on different time zones."),
+            preference_section="query",
+            examples=["time Berlin", "clock Los Angeles"],
+        )
+
+    def post_search(self, request: "SXNG_Request", search: "SearchWithPlugins") -> EngineResults:
+        """The plugin uses the :py:obj:`searx.weather.GeoLocation` class, which
+        is already implemented in the context of weather forecasts, to determine
+        the time zone. The :py:obj:`searx.weather.DateTime` class is used for
+        the localized display of date and time."""
+
+        results = EngineResults()
+        if search.search_query.pageno > 1:
+            return results
+
+        # remove keywords from the query
+        query = search.search_query.query
+        query_parts = filter(lambda part: part.lower() not in self.keywords, query.split(" "))
+        search_term = " ".join(query_parts).strip()
+
+        if not search_term:
+            date_time = DateTime(time=datetime.datetime.now())
+            results.add(results.types.Answer(answer=date_time.l10n()))
+            return results
+
+        geo = GeoLocation.by_query(search_term=search_term)
+        if geo:
+            date_time = DateTime(time=datetime.datetime.now(tz=geo.zoneinfo))
+            tz_name = geo.timezone.replace('_', ' ')
+            results.add(
+                results.types.Answer(
+                    answer=(f"{tz_name}:" f" {date_time.l10n()} ({date_time.datetime.strftime('%Z')})")
+                )
+            )
+
+        return results