diff --git a/frontend/theseven/cursesui.py b/frontend/theseven/cursesui.py
index ccbf054..588bf67 100644
--- a/frontend/theseven/cursesui.py
+++ b/frontend/theseven/cursesui.py
@@ -86,7 +86,7 @@ class CursesUI(object):
     for pool in pools:
       bold = "B" if len(pool["children"]) > 0 else ""
       uptime = 1
-      try: uptime = (datetime.datetime.utcnow() - pool["starttime"]).total_seconds()
+      try: uptime = (time.time() - pool["starttime"])
       except: pass
       try: failedpercent = 100. * pool["failedreqs"] / pool["requests"]
       except: failedpercent = 0
@@ -117,7 +117,7 @@ class CursesUI(object):
     for worker in workers:
       bold = "B" if len(worker["children"]) > 0 else ""
       uptime = 1
-      try: uptime = (datetime.datetime.utcnow() - worker["starttime"]).total_seconds()
+      try: uptime = (time.time() - worker["starttime"])
       except: pass
       try: stalepercent = 100. * worker["rejected"] / (worker["accepted"] + worker["rejected"])
       except: stalepercent = 0
diff --git a/miner.py b/miner.py
index f39310f..111bf1f 100755
--- a/miner.py
+++ b/miner.py
@@ -94,7 +94,7 @@ class OutputRedirector(object):
 class Blockchain(object):
   def __init__(self, miner):
     self.miner = miner
-    self.lastlongpoll = datetime.datetime.utcnow() - datetime.timedelta(seconds = self.miner.longpollgrouptime)
+    self.lastlongpoll = time.time() - self.miner.longpollgrouptime
     self.longpollepoch = 0
 
 class Miner(object):
@@ -184,12 +184,12 @@ class Miner(object):
       self.fetchersrunning = self.fetchersrunning + 1
       queuedelay = self.queuelength / self.jobspersecond
       while True:
-        now = datetime.datetime.utcnow()
+        now = time.time()
         best = None
         pool = None
         for p in self.pools:
           p.score = p.score * self.biasdecay
-          excessmhashes = p.mhashes - ((now - p.starttime).total_seconds() + queuedelay) * p.hashrate
+          excessmhashes = p.mhashes - ((now - p.starttime) + queuedelay) * p.hashrate
           score = excessmhashes - p.score
           if excessmhashes - max(0, p.score) >= 0:
             if p.priority > 0: score = max(0, score / p.priority)
@@ -207,11 +207,11 @@ class Miner(object):
 
   def fetcher(self, pool):
     with self.queuelock:
-      if (datetime.datetime.utcnow() - pool.blockchain.lastlongpoll).total_seconds() > self.longpollgrouptime:
+      if (time.time() - pool.blockchain.lastlongpoll) > self.longpollgrouptime:
         pool.longpollepoch = pool.blockchain.longpollepoch
       epoch = pool.longpollepoch
       if epoch < pool.blockchain.longpollepoch:
-        pool.blockeduntil = pool.blockchain.lastlongpoll + datetime.timedelta(seconds = self.longpollgrouptime)
+        pool.blockeduntil = pool.blockchain.lastlongpoll + self.longpollgrouptime
         with self.fetcherlock:
           self.fetchersrunning = self.fetchersrunning - 1
           self.adjustfetchers()
@@ -227,7 +227,7 @@ class Miner(object):
         pool.failedreqs = pool.failedreqs + 1
         pool.score = pool.score + self.getworkfailbias
       with self.queuelock:
-        pool.blockeduntil = datetime.datetime.utcnow() + datetime.timedelta(seconds = 3)
+        pool.blockeduntil = time.time() + 3
     if job != None:
       self.queuelock.acquire()
       if epoch == pool.blockchain.longpollepoch:
@@ -272,9 +272,9 @@ class Miner(object):
     with self.queuelock:
       job.pool.longpollepoch = job.pool.longpollepoch + 1
       if job.pool.longpollepoch >= job.pool.blockchain.longpollepoch:
-        job.pool.blockeduntil = datetime.datetime.utcnow()
+        job.pool.blockeduntil = time.time()
       if job.pool.longpollepoch > job.pool.blockchain.longpollepoch:
-        job.pool.blockchain.lastlongpoll = datetime.datetime.utcnow()
+        job.pool.blockchain.lastlongpoll = time.time()
         job.pool.blockchain.longpollepoch = job.pool.longpollepoch
         for w in self.workers:
           try: w.cancel(job.pool.blockchain)
diff --git a/pool/theseven/bcjsonrpc.py b/pool/theseven/bcjsonrpc.py
index 9a58f9d..66e92f0 100644
--- a/pool/theseven/bcjsonrpc.py
+++ b/pool/theseven/bcjsonrpc.py
@@ -43,7 +43,7 @@
 import sys
 import common
 import base64
-import datetime
+import time
 import json
 import threading
 import curses
@@ -84,8 +84,8 @@ class JSONRPCPool(object):
     self.rejected = 0
     self.score = 0
     self.mhashes = 0
-    self.starttime = datetime.datetime.utcnow()
-    self.blockeduntil = datetime.datetime.utcnow()
+    self.starttime = time.time()
+    self.blockeduntil = time.time()
     self.difficulty = 0
 
   def getstatistics(self, childstats):
diff --git a/worker/fpgamining/x6500.py b/worker/fpgamining/x6500.py
index 8ecbfb2..93a6d09 100644
--- a/worker/fpgamining/x6500.py
+++ b/worker/fpgamining/x6500.py
@@ -39,7 +39,6 @@ import common
 import binascii
 import threading
 import time
-import datetime
 import hashlib
 import struct
 import atexit
@@ -99,7 +98,7 @@ class X6500Worker(object):
     self.accepted = 0      # Number of accepted shares produced by this worker * difficulty
     self.rejected = 0      # Number of rejected shares produced by this worker * difficulty
     self.invalid = 0       # Number of invalid shares produced by this worker
-    self.starttime = datetime.datetime.utcnow()  # Start timestamp (to get average MH/s from MHashes)
+    self.starttime = time.time()  # Start timestamp (to get average MH/s from MHashes)
 
     # Statistics lock, ensures that the UI can get a consistent statistics state
     # Needs to be acquired during all operations that affect the above values
@@ -251,7 +250,7 @@ class X6500FPGA(object):
     self.accepted = 0      # Number of accepted shares produced by this worker * difficulty
     self.rejected = 0      # Number of rejected shares produced by this worker * difficulty
     self.invalid = 0       # Number of invalid shares produced by this worker
-    self.starttime = datetime.datetime.utcnow()  # Start timestamp (to get average MH/s from MHashes)
+    self.starttime = time.time()  # Start timestamp (to get average MH/s from MHashes)
     self.temperature = None
 
     # Statistics lock, ensures that the UI can get a consistent statistics state
@@ -484,7 +483,7 @@ class X6500FPGA(object):
       # In that case, just restart things to clean up the situation.
       if oldjob == None: raise Exception("Mining device sent a share before even getting a job")
       # Stop time measurement
-      oldjob.endtime = datetime.datetime.utcnow()
+      oldjob.endtime = time.time()
       # Pass the nonce that we found to the work source, if there is one.
       # Do this before calculating the hash rate as it is latency critical.
       if oldjob != None:
@@ -503,7 +502,7 @@ class X6500FPGA(object):
           if self.seconditeration == True:
             with self.wakeup:
               # This is the second iteration. We now know the actual nonce rotation time.
-              delta = (oldjob.endtime - oldjob.starttime).total_seconds()
+              delta = (oldjob.endtime - oldjob.starttime)
               # Calculate the hash rate based on the nonce rotation time.
               self.mhps = 2**32 / 1000000. / delta
               # Tell the MPBM core that our hash rate has changed, so that it can adjust its work buffer.
@@ -521,7 +520,7 @@ class X6500FPGA(object):
               self.seconditeration = True
       else:
         # Adjust hash rate tracking
-        delta = (oldjob.endtime - self.lasttime).total_seconds()
+        delta = (oldjob.endtime - self.lasttime)
         nonce = struct.unpack("<I", nonce)[0]
         estimatednonce = int(round(self.lastnonce + self.mhps * 1000000 * delta))
         noncediff = nonce - (estimatednonce & 0xffffffff)
@@ -547,13 +546,13 @@ class X6500FPGA(object):
     self.fpga.writeJob(job)
     # Try to grab any leftover nonces from the previous job in time
     self.checknonces()
-    now = datetime.datetime.utcnow()
+    now = time.time()
     if self.job != None and self.job.starttime != None and self.job.pool != None:
-      mhashes = (now - self.job.starttime).total_seconds() * self.mhps
+      mhashes = (now - self.job.starttime) * self.mhps
       self.job.finish(mhashes, self)
       self.job.starttime = None
     # Acknowledge the job by moving it from nextjob to job
     self.job = self.nextjob
     self.job.starttime = now
     self.nextjob = None
-        
\ No newline at end of file
+        
diff --git a/worker/fpgamining/x6500hotplug.py b/worker/fpgamining/x6500hotplug.py
index 55ea13e..0db0726 100644
--- a/worker/fpgamining/x6500hotplug.py
+++ b/worker/fpgamining/x6500hotplug.py
@@ -36,7 +36,7 @@
 
 import sys
 import time
-import datetime
+import time
 import threading
 import worker.fpgamining.x6500
 
@@ -75,7 +75,7 @@ class X6500HotplugWorker(object):
     self.accepted = 0      # Number of accepted shares produced by this worker * difficulty
     self.rejected = 0      # Number of rejected shares produced by this worker * difficulty
     self.invalid = 0       # Number of invalid shares produced by this worker
-    self.starttime = datetime.datetime.utcnow()  # Start timestamp (to get average MH/s from MHashes)
+    self.starttime = time.time() # Start timestamp (to get average MH/s from MHashes)
 
     # Statistics lock, ensures that the UI can get a consistent statistics state
     # Needs to be acquired during all operations that affect the above values
diff --git a/worker/theseven/simplers232.py b/worker/theseven/simplers232.py
index 06a07b2..0b15b33 100644
--- a/worker/theseven/simplers232.py
+++ b/worker/theseven/simplers232.py
@@ -297,7 +297,7 @@ class SimpleRS232Worker(object):
           # rate to get the number of MHashes calculated for that job and update statistics.
           now = datetime.datetime.utcnow()
           if self.job != None and self.job.starttime != None and self.job.pool != None:
-            mhashes = (now - self.job.starttime).total_seconds() * self.mhps
+            mhashes = (now - self.job.starttime) * self.mhps
             self.job.finish(mhashes, self)
             self.job.starttime = None
 
@@ -322,7 +322,7 @@ class SimpleRS232Worker(object):
           # Do this before calculating the hash rate as it is latency critical.
           if self.job != None: self.job.sendresult(nonce, self)
           # Calculate actual on-device processing time (not including transfer times) of the job.
-          delta = (self.job.endtime - self.job.starttime).total_seconds() - 40. / self.baudrate
+          delta = (self.job.endtime - self.job.starttime) - 40. / self.baudrate
           # Calculate the hash rate based on the processing time and number of neccessary MHashes.
           # This assumes that the device processes all nonces (starting at zero) sequentially.
           self.mhps = struct.unpack("<I", nonce)[0] / 1000000. / delta
@@ -349,7 +349,7 @@ class SimpleRS232Worker(object):
           if self.job.check != None: raise Exception("Validation job terminated without finding a share")
           # Stop measuring time because the device is doing duplicate work right now
           if self.job != None and self.job.starttime != None and self.job.pool != None:
-            mhashes = (datetime.datetime.utcnow() - self.job.starttime).total_seconds() * self.mhps
+            mhashes = (time.time() - self.job.starttime) * self.mhps
             with self.job.pool.statlock: self.job.pool.mhashes = self.job.pool.mhashes + mhashes
             self.mhashes = self.mhashes + mhashes
             self.job.starttime = None