diff --git a/poky/meta/classes/reproducible_build.bbclass b/poky/meta/classes/reproducible_build.bbclass
index 8da40f6..2f3bd90 100644
--- a/poky/meta/classes/reproducible_build.bbclass
+++ b/poky/meta/classes/reproducible_build.bbclass
@@ -70,100 +70,16 @@
 addtask do_deploy_source_date_epoch_setscene
 addtask do_deploy_source_date_epoch before do_configure after do_patch
 
-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(sourcedir, file)
-        if os.path.isfile(filepath):
-            mtime = int(os.lstat(filepath).st_mtime)
-            # There may be more than one "known_file" present, if so, use the youngest one
-            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(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:
-            return root
-
-    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):
-    if sourcedir == d.getVar('WORKDIR'):
-       # These sources are almost certainly not from a tarball
-       return None
-
-    # Do it the hard way: check all files and find the youngest one...
-    source_date_epoch = None
-    newest_file = None
-    for root, dirs, files in os.walk(sourcedir, topdown=True):
-        files = [f for f in files if not f[0] == '.']
-
-        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
-
-def fixed_source_date_epoch():
-    bb.debug(1, "No tarball or git repo found to determine SOURCE_DATE_EPOCH")
-    return 0
-
 python create_source_date_epoch_stamp() {
+    import oe.reproducible
+
     epochfile = d.getVar('SDE_FILE')
     # If it exists we need to regenerate as the sources may have changed
     if os.path.isfile(epochfile):
         bb.debug(1, "Deleting existing SOURCE_DATE_EPOCH from: %s" % epochfile)
         os.remove(epochfile)
 
-    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
-        fixed_source_date_epoch()       # Last resort
-    )
+    source_date_epoch = oe.reproducible.get_source_date_epoch(d, d.getVar('S'))
 
     bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
     bb.utils.mkdirhier(d.getVar('SDE_DIR'))