From 4a8635d4a25549a5bd1221196c728eccf970d45f Mon Sep 17 00:00:00 2001
From: Goffi <goffi@goffi.org>
Date: Thu, 30 Mar 2023 16:52:18 +0200
Subject: [PATCH] tools (common/date_utils): new `get_timezone_name` to
 retrieve it from a tzinfo and a timestamp

---
 sat/tools/common/date_utils.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sat/tools/common/date_utils.py b/sat/tools/common/date_utils.py
index a9a16556..03c556d3 100644
--- a/sat/tools/common/date_utils.py
+++ b/sat/tools/common/date_utils.py
@@ -247,3 +247,21 @@ def delta2human(start_ts: Union[float, int], end_ts: Union[float, int]) -> str:
             text_elems.append(f"{value} {unit}")
 
     return ", ".join(text_elems)
+
+
+def get_timezone_name(tzinfo, timestamp: Union[float, int]) -> str:
+    """
+    Get the DST-aware timezone name for a given timezone and timestamp.
+
+    @param tzinfo: The timezone to get the name for
+    @param timestamp: The timestamp to use, as a Unix timestamp (number of seconds since
+        the Unix epoch).
+    @return: The DST-aware timezone name.
+    """
+
+    dt = datetime.datetime.fromtimestamp(timestamp)
+    dt_tz = dt.replace(tzinfo=tzinfo)
+    tz_name = dt_tz.tzname()
+    if tz_name is None:
+        raise exceptions.InternalError("tz_name should not be None")
+    return tz_name