diff --git a/ptrace/linux_proc.py b/ptrace/linux_proc.py
index 84adc7c..82ca412 100644
--- a/ptrace/linux_proc.py
+++ b/ptrace/linux_proc.py
@@ -7,8 +7,7 @@
 """
 from os import readlink, listdir
 from resource import getpagesize
-from ptrace.tools import timestampUNIX
-from datetime import timedelta
+from datetime import timedelta, datetime
 
 PAGE_SIZE = getpagesize()
 
@@ -233,7 +232,7 @@ def getSystemBoot():
             if not line.startswith("btime "):
                 continue
             seconds = int(line[6:])
-            btime = timestampUNIX(seconds, True)
+            btime = datetime.fromtimestamp(seconds)
             getSystemBoot.value = btime
             break
         stat_file.close()
diff --git a/ptrace/tools.py b/ptrace/tools.py
index 6680d48..3c0e557 100644
--- a/ptrace/tools.py
+++ b/ptrace/tools.py
@@ -78,32 +78,6 @@ def formatBits(value, bitmasks, empty_text=None, format_value=str):
             return str(value)
 
 
-LOCAL_TIMEZONE_OFFSET = datetime.fromtimestamp(
-    0) - datetime.utcfromtimestamp(0)
-
-# Start of UNIX timestamp (Epoch): 1st January 1970 at 00:00
-UNIX_TIMESTAMP_T0 = datetime(1970, 1, 1)
-
-
-def timestampUNIX(value, is_local):
-    """
-    Convert an UNIX (32-bit) timestamp to datetime object. Timestamp value
-    is the number of seconds since the 1st January 1970 at 00:00. Maximum
-    value is 2147483647: 19 january 2038 at 03:14:07.
-
-    May raise ValueError for invalid value: value have to be in 0..2147483647.
-
-    >>> timestampUNIX(0, False)
-    datetime.datetime(1970, 1, 1, 0, 0)
-    >>> timestampUNIX(1154175644.37, False)
-    datetime.datetime(2006, 7, 29, 12, 20, 44, 370000)
-    """
-    timestamp = UNIX_TIMESTAMP_T0 + timedelta(seconds=value)
-    if is_local:
-        timestamp += LOCAL_TIMEZONE_OFFSET
-    return timestamp
-
-
 def locateProgram(program):
     """
     Locate a program using the PATH environment variable. Return the