[JinJa2] Corrected the macro used for comments on the test file. (#3373)

* Corrected the macro for comments on the test file.
* Added current_date (utcnow()) variable available for template macros.
* Removed unnecessary datetime import from macros file.
* Regenerated all practice exercise test files to add timestamp.
* Changed `datetime.now(tz=timezone.utc)` to `datetime.now(tz=timezone.utc).date()`
* Second regeneration to remove `timestamp` and just keep `date` for test files.
[no important files changed]

bin/generate_tests.py

@@ -17,12 +17,13 @@ import sys
 from githelp import Repo
 
 _py = sys.version_info
-if _py.major < 3 or (_py.major == 3 and _py.minor < 6):
-    print("Python version must be at least 3.6")
+if _py.major < 3 or (_py.major == 3 and _py.minor < 7):
+    print("Python version must be at least 3.7")
     sys.exit(1)
 
 import argparse
 from datetime import datetime
+from datetime import timezone
 import difflib
 import filecmp
 import importlib.util
@@ -393,6 +394,7 @@ def generate(
     env.filters["zip"] = zip
     env.filters["parse_datetime"] = parse_datetime
     env.filters["escape_invalid_escapes"] = escape_invalid_escapes
+    env.globals["current_date"] = datetime.now(tz=timezone.utc).date()
     env.tests["error_case"] = error_case
     result = True
     for exercise in sorted(Path("exercises/practice").glob(exercise_glob)):