diff --git a/.gitignore b/.gitignore
index 7f7cccc..d441544 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,3 +58,4 @@ docs/_build/
 # PyBuilder
 target/
 
+test_*.py
\ No newline at end of file
diff --git a/build.py b/build.py
index 2bce11b..d49f6f6 100644
--- a/build.py
+++ b/build.py
@@ -1,9 +1,26 @@
 import os
-from util import get_drives()
+import os.path as osp
+import datetime
+from util import no_parents
+from util import get_drives
 def build(after,*starts):
-    if starts:
-        paths = starts
-    else:
-        paths = get_drives()
-    for path in paths:
-        for root,dirs,files in os.walk(
\ No newline at end of file
+    if isinstance(after,datetime.datetime):
+        after = after.timestamp()
+    var_unsubbed =  map(osp.expandvars,starts)
+    abs_paths = map(osp.abspath,var_unsubbed)
+    starts = list(no_parents(abs_paths))
+    ret = []
+    for path in starts:
+        for root,dirs,files in os.walk(path,topdown=True):
+            try:
+                dirs[:] = list(filter(
+                    lambda p: osp.getmtime(osp.join(root,p)) > after,
+                    dirs
+                    ))
+                ret += [osp.join(root,file) for file in files]
+            except:
+                print('Error',root,sep= ': ')
+    return ret
+if __name__ == "__main__":
+    td = datetime.datetime.today()
+    ret = build(datetime.datetime(td.year,(td.month - 1 -1)%12+1,1),r'X:\Users\Ralphie')
\ No newline at end of file
diff --git a/update_mtimes.py b/update_mtimes.py
new file mode 100644
index 0000000..7032917
--- /dev/null
+++ b/update_mtimes.py
@@ -0,0 +1,13 @@
+import ctypes
+import os
+def is_admin():
+    return ctypes.windll.shell32.IsUserAnAdmin() != 0
+exe_path = os.path.expandvars(r"%userprofile%\portables"
+                              r"\foldertimeupdate"
+                              r"\FolderTimeUpdate.exe"
+                              )
+def update(*starts,force_admin = True):
+    if not is_admin() and force_admin:
+        raise Exception("Process must be admin")
+    for start in starts:
+        subprocess.check_call([exe_path,'/stext','null','/BaseFolder',start])
diff --git a/util.py b/util.py
index a478222..5b3a19d 100644
--- a/util.py
+++ b/util.py
@@ -1,5 +1,7 @@
 from ctypes import windll
-#https://stackoverflow.com/questions/827371/is-there-a-way-to-list-all-the-available-drive-letters-in-python u=RichieHindle
+import os
+#https://stackoverflow.com/questions/827371/is-there-a-way-to-list-all-the-available-drive-letters-in-python 
+#u=RichieHindle
 def get_drives():
     uppercase = map(chr,range(ord('A'),ord('A')+26))
     drives = []
@@ -12,14 +14,16 @@ def get_drives():
     return drives
 
 def no_parents(paths):
-	paths = sorted(paths,key=len)
-	first = True
-	ret = []
-	while len(paths) > 0:
-		el1 = old_paths[0]
-		old_paths = paths[1:]
-		paths = []
-		for path in old_paths:
-			if not paths.startswith(el1):
-				paths.insert(0,path)
+    paths = sorted(paths,key=len)
+    ret = []
+    paths
+    while len(paths) > 0:
+        el1 = paths[0]
+        ret.append(el1)
+        old_paths = paths[1:]
+        paths = []
+        for path in old_paths:
+
+            if not path.startswith(el1):
+                paths.append(path)
     return ret
\ No newline at end of file