diff --git a/poky/meta/classes/reproducible_build.bbclass b/poky/meta/classes/reproducible_build.bbclass
index 2df8053..0eb696a 100644
--- a/poky/meta/classes/reproducible_build.bbclass
+++ b/poky/meta/classes/reproducible_build.bbclass
@@ -1,33 +1,35 @@
-#
 # reproducible_build.bbclass
 #
-# This bbclass is mainly responsible to determine SOURCE_DATE_EPOCH on a per recipe base.
-# We need to set a recipe specific SOURCE_DATE_EPOCH in each recipe environment for various tasks.
-# One way would be to modify all recipes one-by-one to specify SOURCE_DATE_EPOCH explicitly, 
-# but that is not realistic as there are hundreds (probably thousands) of recipes in various meta-layers.
-# Therefore we do it this class. 
-# After sources are unpacked but before they are patched, we try to determine the value for SOURCE_DATE_EPOCH.
+# Sets SOURCE_DATE_EPOCH in each component's build environment.
+# Upstream components (generally) respect this environment variable,
+# using it in place of the "current" date and time.
+# See https://reproducible-builds.org/specs/source-date-epoch/
 #
-# There are 4 ways to determine SOURCE_DATE_EPOCH:
+# After sources are unpacked but before they are patched, we set a reproducible value for SOURCE_DATE_EPOCH.
+# This value should be reproducible for anyone who builds the same revision from the same sources.
 #
-# 1. Use value from __source_date_epoch.txt file if this file exists. 
-#    This file was most likely created in the previous build by one of the following methods 2,3,4. 
-#    In principle, it could actually provided by a recipe via SRC_URI
+# There are 4 ways we determine SOURCE_DATE_EPOCH:
 #
-# If the file does not exist, first try to determine the value for SOURCE_DATE_EPOCH:
+# 1. Use the value from __source_date_epoch.txt file if this file exists.
+#    This file was most likely created in the previous build by one of the following methods 2,3,4.
+#    Alternatively, it can be provided by a recipe via SRC_URI.
 #
-# 2. If we detected a folder .git, use .git last commit date timestamp, as git does not allow checking out
-#    files and preserving their timestamps.
+# If the file does not exist:
+#
+# 2. If there is a git checkout, use the last git commit timestamp.
+#    Git does not preserve file timestamps on checkout.
 #
 # 3. Use the mtime of "known" files such as NEWS, CHANGLELOG, ...
-#    This will work fine for any well kept repository distributed via tarballs.
+#    This works for well-kept repositories distributed via tarball.
 #
-# 4. If the above steps fail, we need to check all package source files and use the youngest file of the source tree.
+# 4. If the above steps fail, use the modification time of the youngest file in the source tree.
 #
-# Once the value of SOURCE_DATE_EPOCH is determined, it is stored in the recipe ${WORKDIR}/source_date_epoch folder
-# in a text file "__source_date_epoch.txt'. If this file is found by other recipe task, the value is exported in
-# the SOURCE_DATE_EPOCH variable in the task environment. This is done in an anonymous python function, 
-# so SOURCE_DATE_EPOCH is guaranteed to exist for all tasks the may use it (do_configure, do_compile, do_package, ...)
+# Once the value of SOURCE_DATE_EPOCH is determined, it is stored in the recipe's SDE_FILE.
+# If none of these mechanisms are suitable, replace the do_deploy_source_date_epoch task
+# with recipe-specific functionality to write the appropriate SOURCE_DATE_EPOCH into the SDE_FILE.
+#
+# If this file is found by other tasks, the value is exported in the SOURCE_DATE_EPOCH variable.
+# SOURCE_DATE_EPOCH is set for all tasks that might use it (do_configure, do_compile, do_package, ...)
 
 BUILD_REPRODUCIBLE_BINARIES ??= '1'
 inherit ${@oe.utils.ifelse(d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1', 'reproducible_build_simple', '')}
@@ -50,86 +52,100 @@
 addtask do_deploy_source_date_epoch_setscene
 addtask do_deploy_source_date_epoch before do_configure after do_patch
 
-def get_source_date_epoch_known_files(d, path):
-    source_date_epoch = 0
+def get_source_date_epoch_from_known_files(d, sourcedir):
+    source_date_epoch = None
+    newest_file = None
     known_files = set(["NEWS", "ChangeLog", "Changelog", "CHANGES"])
     for file in known_files:
-        filepath = os.path.join(path,file)
+        filepath = os.path.join(sourcedir, file)
         if os.path.isfile(filepath):
-            mtime = int(os.path.getmtime(filepath))
+            mtime = int(os.lstat(filepath).st_mtime)
             # There may be more than one "known_file" present, if so, use the youngest one
-            if mtime > source_date_epoch:
+            if not source_date_epoch or mtime > source_date_epoch:
                 source_date_epoch = mtime
+                newest_file = filepath
+    if newest_file:
+        bb.debug(1, "SOURCE_DATE_EPOCH taken from: %s" % newest_file)
     return source_date_epoch
 
-def find_git_folder(path):
-    exclude = set(["temp", "license-destdir", "patches", "recipe-sysroot-native", "recipe-sysroot", "pseudo", "build", "image", "sysroot-destdir"])
-    for root, dirs, files in os.walk(path, topdown=True):
+def find_git_folder(d, sourcedir):
+    # First guess: WORKDIR/git
+    # This is the default git fetcher unpack path
+    workdir = d.getVar('WORKDIR')
+    gitpath = os.path.join(workdir, "git/.git")
+    if os.path.isdir(gitpath):
+        return gitpath
+
+    # Second guess: ${S}
+    gitpath = os.path.join(sourcedir, ".git")
+    if os.path.isdir(gitpath):
+        return gitpath
+
+    # Perhaps there was a subpath or destsuffix specified.
+    # Go looking in the WORKDIR
+    exclude = set(["build", "image", "license-destdir", "patches", "pseudo",
+                   "recipe-sysroot", "recipe-sysroot-native", "sysroot-destdir", "temp"])
+    for root, dirs, files in os.walk(workdir, topdown=True):
         dirs[:] = [d for d in dirs if d not in exclude]
         if '.git' in dirs:
-            #bb.warn("found root:%s" % (str(root)))
             return root
-     
-def get_source_date_epoch_git(d, path):
-    source_date_epoch = 0
-    if "git://" in d.getVar('SRC_URI'):
-        gitpath = find_git_folder(d.getVar('WORKDIR'))
-        if gitpath != None:
-            import subprocess
-            if os.path.isdir(os.path.join(gitpath,".git")):
-                try:
-                    source_date_epoch = int(subprocess.check_output(['git','log','-1','--pretty=%ct'], cwd=path))
-                    #bb.warn("JB *** gitpath:%s sde: %d" % (gitpath,source_date_epoch))
-                    bb.debug(1, "git repo path:%s sde: %d" % (gitpath,source_date_epoch))
-                except subprocess.CalledProcessError as grepexc:
-                    #bb.warn( "Expected git repository not found, (path: %s) error:%d" % (gitpath, grepexc.returncode))
-                    bb.debug(1, "Expected git repository not found, (path: %s) error:%d" % (gitpath, grepexc.returncode))
-        else:
-            bb.warn("Failed to find a git repository for path:%s" % (path))
-    return source_date_epoch
-            
-python do_create_source_date_epoch_stamp() {
-    path = d.getVar('S')
-    if not os.path.isdir(path):
-        bb.warn("Unable to determine source_date_epoch! path:%s" % path)
-        return
 
+    bb.warn("Failed to find a git repository in WORKDIR: %s" % workdir)
+    return None
+
+def get_source_date_epoch_from_git(d, sourcedir):
+    source_date_epoch = None
+    if "git://" in d.getVar('SRC_URI'):
+        gitpath = find_git_folder(d, sourcedir)
+        if gitpath:
+            import subprocess
+            source_date_epoch = int(subprocess.check_output(['git','log','-1','--pretty=%ct'], cwd=gitpath))
+            bb.debug(1, "git repository: %s" % gitpath)
+    return source_date_epoch
+
+def get_source_date_epoch_from_youngest_file(d, sourcedir):
+    # Do it the hard way: check all files and find the youngest one...
+    source_date_epoch = None
+    newest_file = None
+    # Just in case S = WORKDIR
+    exclude = set(["build", "image", "license-destdir", "patches", "pseudo",
+                   "recipe-sysroot", "recipe-sysroot-native", "sysroot-destdir", "temp"])
+    for root, dirs, files in os.walk(sourcedir, topdown=True):
+        files = [f for f in files if not f[0] == '.']
+        dirs[:] = [d for d in dirs if d not in exclude]
+
+        for fname in files:
+            filename = os.path.join(root, fname)
+            try:
+                mtime = int(os.lstat(filename).st_mtime)
+            except ValueError:
+                mtime = 0
+            if not source_date_epoch or mtime > source_date_epoch:
+                source_date_epoch = mtime
+                newest_file = filename
+
+    if newest_file:
+        bb.debug(1, "Newest file found: %s" % newest_file)
+    return source_date_epoch
+
+python do_create_source_date_epoch_stamp() {
     epochfile = d.getVar('SDE_FILE')
     if os.path.isfile(epochfile):
-        bb.debug(1, " path: %s reusing __source_date_epoch.txt" % epochfile)
+        bb.debug(1, "Reusing SOURCE_DATE_EPOCH from: %s" % epochfile)
         return
- 
-    # Try to detect/find a git repository
-    source_date_epoch = get_source_date_epoch_git(d, path)
+
+    sourcedir = d.getVar('S')
+    source_date_epoch = (
+        get_source_date_epoch_from_git(d, sourcedir) or
+        get_source_date_epoch_from_known_files(d, sourcedir) or
+        get_source_date_epoch_from_youngest_file(d, sourcedir) or
+        0       # Last resort
+    )
     if source_date_epoch == 0:
-        source_date_epoch = get_source_date_epoch_known_files(d, path)
-    if source_date_epoch == 0:
-        # Do it the hard way: check all files and find the youngest one...
-        filename_dbg = None
-        exclude = set(["temp", "license-destdir", "patches", "recipe-sysroot-native", "recipe-sysroot", "pseudo", "build", "image", "sysroot-destdir"])
-        for root, dirs, files in os.walk(path, topdown=True):
-            files = [f for f in files if not f[0] == '.']
-            dirs[:] = [d for d in dirs if d not in exclude]
+        # empty folder, not a single file ...
+        bb.debug(1, "No files found to determine SOURCE_DATE_EPOCH")
 
-            for fname in files:
-                filename = os.path.join(root, fname)
-                try:
-                    mtime = int(os.path.getmtime(filename))
-                except ValueError:
-                    mtime = 0
-                if mtime > source_date_epoch:
-                    source_date_epoch = mtime
-                    filename_dbg = filename
-
-        if filename_dbg != None:
-            bb.debug(1," SOURCE_DATE_EPOCH %d derived from: %s" % (source_date_epoch, filename_dbg))
-
-        if source_date_epoch == 0:
-            # empty folder, not a single file ...
-            # kernel source do_unpack is special cased
-            if not bb.data.inherits_class('kernel', d):
-                bb.debug(1, "Unable to determine source_date_epoch! path:%s" % path)
-
+    bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
     bb.utils.mkdirhier(d.getVar('SDE_DIR'))
     with open(epochfile, 'w') as f:
         f.write(str(source_date_epoch))
@@ -145,6 +161,6 @@
         if os.path.isfile(epochfile):
             with open(epochfile, 'r') as f:
                 source_date_epoch = f.read()
-            bb.debug(1, "source_date_epoch stamp found ---> stamp %s" % source_date_epoch)
+            bb.debug(1, "SOURCE_DATE_EPOCH: %s" % source_date_epoch)
         d.setVar('SOURCE_DATE_EPOCH', source_date_epoch)
 }