[PATCH v3 26/33] scripts/kernel-doc.py: properly handle KBUILD_BUILD_TIMESTAMP

[Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>]

The logic that handles KBUILD_BUILD_TIMESTAMP is wrong, and adds
a dependency of a third party module (dateutil).

Fix it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 scripts/lib/kdoc/kdoc_files.py  |  9 ---------
 scripts/lib/kdoc/kdoc_output.py | 28 +++++++++++++++++++++-------
 2 files changed, 21 insertions(+), 16 deletions(-)

diff --git a/scripts/lib/kdoc/kdoc_files.py b/scripts/lib/kdoc/kdoc_files.py
index 5a6e92e34d05..e52a6d05237e 100644
--- a/scripts/lib/kdoc/kdoc_files.py
+++ b/scripts/lib/kdoc/kdoc_files.py
@@ -13,9 +13,6 @@ import logging
 import os
 import re
 import sys
-from datetime import datetime
-
-from dateutil import tz
 
 from kdoc_parser import KernelDoc
 from kdoc_output import OutputFormat
@@ -137,12 +134,6 @@ class KernelFiles():
         if out_style is None:
             out_style = OutputFormat()
 
-        dt = datetime.now()
-        if os.environ.get("KBUILD_BUILD_TIMESTAMP", None):
-            # use UTC TZ
-            to_zone = tz.gettz('UTC')
-            dt = dt.astimezone(to_zone)
-
         if not werror:
             kcflags = os.environ.get("KCFLAGS", None)
             if kcflags:
diff --git a/scripts/lib/kdoc/kdoc_output.py b/scripts/lib/kdoc/kdoc_output.py
index 8be69245c0d0..eb013075da84 100755
--- a/scripts/lib/kdoc/kdoc_output.py
+++ b/scripts/lib/kdoc/kdoc_output.py
@@ -19,8 +19,6 @@ import os
 import re
 from datetime import datetime
 
-from dateutil import tz
-
 from kdoc_parser import KernelDoc, type_param
 from kdoc_re import Re
 
@@ -586,6 +584,15 @@ class ManFormat(OutputFormat):
     )
     blankline = ""
 
+    date_formats = [
+        "%a %b %d %H:%M:%S %Z %Y",
+        "%a %b %d %H:%M:%S %Y",
+        "%Y-%m-%d",
+        "%b %d %Y",
+        "%B %d %Y",
+        "%m %d %Y",
+    ]
+
     def __init__(self, modulename):
         """
         Creates class variables.
@@ -597,11 +604,18 @@ class ManFormat(OutputFormat):
         super().__init__()
         self.modulename = modulename
 
-        dt = datetime.now()
-        if os.environ.get("KBUILD_BUILD_TIMESTAMP", None):
-            # use UTC TZ
-            to_zone = tz.gettz('UTC')
-            dt = dt.astimezone(to_zone)
+        dt = None
+        tstamp = os.environ.get("KBUILD_BUILD_TIMESTAMP")
+        if tstamp:
+            for fmt in self.date_formats:
+                try:
+                    dt = datetime.strptime(tstamp, fmt)
+                    break
+                except ValueError:
+                    pass
+
+        if not dt:
+            dt = datetime.now()
 
         self.man_date = dt.strftime("%B %Y")
 
-- 
2.49.0