migrate from utcfromtimestamp to fromtimestamp (matplotlib#25918)

closes matplotlib#25912

Author: smeet07

doc/api/prev_api_changes/api_changes_3.7.0/removals.rst

@@ -7,7 +7,7 @@ Removals
 These methods convert from unix timestamps to matplotlib floats, but are not
 used internally to Matplotlib, and should not be needed by end users. To
 convert a unix timestamp to datetime, simply use
-`datetime.datetime.utcfromtimestamp`, or to use NumPy `~numpy.datetime64`
+`datetime.datetime.fromtimestamp`, or to use NumPy `~numpy.datetime64`
 ``dt = np.datetime64(e*1e6, 'us')``.
 
 Locator and Formatter wrapper methods

doc/conf.py

@@ -23,6 +23,7 @@
 
 import matplotlib
 
+from datetime import timezone
 from datetime import datetime
 import time
 
@@ -73,8 +74,8 @@ def _parse_skip_subdirs_file():
 
 # Parse year using SOURCE_DATE_EPOCH, falling back to current time.
 # https://reproducible-builds.org/specs/source-date-epoch/
-sourceyear = datetime.utcfromtimestamp(
-    int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))).year
+sourceyear = datetime.fromtimestamp(
+    int(os.environ.get('SOURCE_DATE_EPOCH', time.time())), timezone.utc).year
 
 # If your extensions are in another directory, add it here. If the directory
 # is relative to the documentation root, use os.path.abspath to make it

lib/matplotlib/backends/backend_pdf.py

@@ -5,6 +5,7 @@
 """
 
 import codecs
+from datetime import timezone
 from datetime import datetime
 from enum import Enum
 from functools import total_ordering
@@ -148,7 +149,7 @@ def _create_pdf_info_dict(backend, metadata):
     # See https://reproducible-builds.org/specs/source-date-epoch/
     source_date_epoch = os.getenv("SOURCE_DATE_EPOCH")
     if source_date_epoch:
-        source_date = datetime.utcfromtimestamp(int(source_date_epoch))
+        source_date = datetime.fromtimestamp(int(source_date_epoch), timezone.utc)
         source_date = source_date.replace(tzinfo=UTC)
     else:
         source_date = datetime.today()

lib/matplotlib/backends/backend_ps.py

@@ -826,8 +826,9 @@ def _print_ps(
         # See https://reproducible-builds.org/specs/source-date-epoch/
         source_date_epoch = os.getenv("SOURCE_DATE_EPOCH")
         dsc_comments["CreationDate"] = (
-            datetime.datetime.utcfromtimestamp(
-                int(source_date_epoch)).strftime("%a %b %d %H:%M:%S %Y")
+            datetime.datetime.fromtimestamp(
+                int(source_date_epoch),
+                datetime.timezone.utc).strftime("%a %b %d %H:%M:%S %Y")
             if source_date_epoch
             else time.ctime())
         dsc_comments = "\n".join(

lib/matplotlib/backends/backend_svg.py

@@ -380,7 +380,7 @@ def _write_metadata(self, metadata):
             # See https://reproducible-builds.org/specs/source-date-epoch/
             date = os.getenv("SOURCE_DATE_EPOCH")
             if date:
-                date = datetime.datetime.utcfromtimestamp(int(date))
+                date = datetime.datetime.fromtimestamp(int(date), datetime.timezone.utc)
                 metadata['Date'] = date.replace(tzinfo=UTC).isoformat()
             else:
                 metadata['Date'] = datetime.datetime.today().isoformat()