chore: swap out deprecated datetime's utcnow and utcfromtimestamp (#11850)

See #11608 and
#11497.

Starting with [Python
3.12](https://docs.python.org/3/whatsnew/3.12.html), there were changes
to datetime:
>
[datetime](https://docs.python.org/3/library/datetime.html#module-datetime):
[datetime.datetime](https://docs.python.org/3/library/datetime.html#datetime.datetime)’s
[utcnow()](https://docs.python.org/3/library/datetime.html#datetime.datetime.utcnow)
and
[utcfromtimestamp()](https://docs.python.org/3/library/datetime.html#datetime.datetime.utcfromtimestamp)
are deprecated and will be removed in a future version. Instead, use
timezone-aware objects to represent datetimes in UTC: respectively, call
[now()](https://docs.python.org/3/library/datetime.html#datetime.datetime.now)
and
[fromtimestamp()](https://docs.python.org/3/library/datetime.html#datetime.datetime.fromtimestamp)
with the tz parameter set to
[datetime.UTC](https://docs.python.org/3/library/datetime.html#datetime.UTC).
(Contributed by Paul Ganssle in
[gh-103857](python/cpython#103857).)

The result is that the usage of **utcnow** and **utcfromtimestamp** now
throw deprecation warnings when used, ie:
> DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated
and scheduled for removal in a future version. Use timezone-aware
objects to represent datetimes in UTC:
datetime.datetime.fromtimestamp(timestamp, datetime.UTC).


There's a difference of `+00:00` between the old version and the new
format.

**For utcnow -> now**
- `datetime.datetime.utcnow().isoformat()` |
`'2025-01-02T19:51:32.579733'`
- `datetime.datetime.now(datetime.timezone.utc).isoformat()` |
`'2025-01-02T19:51:02.275232+00:00'`

**For utcfromtimestamp -> fromtimestamp**

Assume that `end_time_ns=1735848645000000000`:
- `(datetime.datetime.fromtimestamp(end_time_ns / 1e9,
tz=datetime.timezone.utc).replace(microsecond=0).isoformat() + "Z")`
    - returns `'2025-01-02T20:10:45+00:00Z'`
- `(datetime.datetime.utcfromtimestamp(end_time_ns /
1e9).replace(microsecond=0).isoformat() + "Z")`
    - returns `'2025-01-02T20:10:45Z'`

As a result, I attempted remove the trailing ones to be consistent with
the old format, but can bring it back.

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Author: wantsui

ddtrace/internal/debug.py

@@ -117,8 +117,8 @@ def collect(tracer):
     from ddtrace._trace.tracer import log
 
     return dict(
-        # Timestamp UTC ISO 8601
-        date=datetime.datetime.utcnow().isoformat(),
+        # Timestamp UTC ISO 8601 with the trailing +00:00 removed
+        date=datetime.datetime.now(datetime.timezone.utc).isoformat()[0:-6],
         # eg. "Linux", "Darwin"
         os_name=platform.system(),
         # eg. 12.5.0

ddtrace/profiling/exporter/http.py

@@ -220,8 +220,18 @@ def export(
             "family": "python",
             "attachments": [item["filename"].decode("utf-8") for item in data],
             "tags_profiler": self._get_tags(service),
-            "start": (datetime.datetime.utcfromtimestamp(start_time_ns / 1e9).replace(microsecond=0).isoformat() + "Z"),
-            "end": (datetime.datetime.utcfromtimestamp(end_time_ns / 1e9).replace(microsecond=0).isoformat() + "Z"),
+            "start": (
+                datetime.datetime.fromtimestamp(start_time_ns / 1e9, tz=datetime.timezone.utc)
+                .replace(microsecond=0)
+                .isoformat()[0:-6]  # removes the trailing +00:00 portion of the time
+                + "Z"
+            ),
+            "end": (
+                datetime.datetime.fromtimestamp(end_time_ns / 1e9, tz=datetime.timezone.utc)
+                .replace(microsecond=0)
+                .isoformat()[0:-6]  # removes the trailing +00:00 portion of the time
+                + "Z"
+            ),
         }  # type: Dict[str, Any]
 
         if self.endpoint_call_counter_span_processor is not None:

tests/appsec/iast_packages/packages/pkg_pyjwt.py

@@ -3,6 +3,7 @@
 
 https://pypi.org/project/PyJWT/
 """
+
 import datetime
 
 from flask import Blueprint
@@ -25,7 +26,10 @@ def pkg_pyjwt_view():
         secret_key = "your-256-bit-secret"
         user_payload = request.args.get("package_param", "default-user")
 
-        payload = {"user": user_payload, "exp": datetime.datetime.utcnow() + datetime.timedelta(seconds=30)}
+        payload = {
+            "user": user_payload,
+            "exp": datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(seconds=30),
+        }
 
         try:
             # Encode the payload to create a JWT