Use regular ".now" instead of ".utcnow" with UTC zone

It is mandated by starting to receive a DeprecationWarning in python 3.12

    DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC)

discovered while addressing some other rot in heudiconv.

nipype/interfaces/base/support.py

@@ -11,7 +11,7 @@
 from copy import deepcopy
 from textwrap import wrap
 import re
-from datetime import datetime as dt
+from datetime import datetime as dt, UTC
 from dateutil.parser import parse as parseutc
 import platform
 
@@ -72,15 +72,15 @@ def __enter__(self):
         if self._runtime.redirect_x:
             self._runtime.environ["DISPLAY"] = config.get_display()
 
-        self._runtime.startTime = dt.isoformat(dt.utcnow())
+        self._runtime.startTime = dt.isoformat(dt.now(UTC))
         self._resmon.start()
         # TODO: Perhaps clean-up path and ensure it exists?
         os.chdir(self._runtime.cwd)
         return self._runtime
 
     def __exit__(self, exc_type, exc_value, exc_tb):
         """Tear-down interface execution."""
-        self._runtime.endTime = dt.isoformat(dt.utcnow())
+        self._runtime.endTime = dt.isoformat(dt.now(UTC))
         timediff = parseutc(self._runtime.endTime) - parseutc(self._runtime.startTime)
         self._runtime.duration = (
             timediff.days * 86400 + timediff.seconds + timediff.microseconds / 1e6

nipype/pipeline/engine/workflows.py

@@ -8,7 +8,7 @@
 import os
 import os.path as op
 import sys
-from datetime import datetime
+from datetime import datetime, UTC
 from copy import deepcopy
 import pickle
 import shutil
@@ -627,7 +627,7 @@ def run(self, plugin=None, plugin_args=None, updatehash=False):
         if str2bool(self.config["execution"]["create_report"]):
             self._write_report_info(self.base_dir, self.name, execgraph)
         runner.run(execgraph, updatehash=updatehash, config=self.config)
-        datestr = datetime.utcnow().strftime("%Y%m%dT%H%M%S")
+        datestr = datetime.now(UTC).strftime("%Y%m%dT%H%M%S")
         if str2bool(self.config["execution"]["write_provenance"]):
             prov_base = op.join(self.base_dir, "workflow_provenance_%s" % datestr)
             logger.info("Provenance file prefix: %s" % prov_base)