diff --git a/exec/nsh.lua b/exec/nsh.lua
index dd0431c..f723449 100644
--- a/exec/nsh.lua
+++ b/exec/nsh.lua
@@ -14,11 +14,11 @@ local function nshcw(h,p)
  end
 end
 net.send(h,p,"initnsh2")
-local bt = os.time()
+local bt = computer.uptime()
 local tp,src,port,msg
 repeat
  tp, src, port, msg = event.pull()
-until (tp == "net_msg" and src == h and port == p) or os.time() > bt+16
+until (tp == "net_msg" and src == h and port == p) or computer.uptime() > bt+16
 if tp == "net_msg" then
  nshcw(h,tonumber(msg))
 else
diff --git a/modules/net/copper.lua b/modules/net/copper.lua
index c9e0c8d..fb2ad48 100644
--- a/modules/net/copper.lua
+++ b/modules/net/copper.lua
@@ -44,17 +44,17 @@ spawn("copperd",function() print(xpcall(function ()
    p.msg = ev[4]
    p.at = 0
    p.lt = 0
-   pt[cdlib.encode(0,net.id,p.nid,relib.encode(p)):sub(2)] = os.time()
+   pt[cdlib.encode(0,net.id,p.nid,relib.encode(p)):sub(2)] = computer.uptime()
    ps[p.pid] = p
   elseif ev[1] == "modem_message" and ev[4] == net.np and ev[6] == "copper" then
    local hops,src,dst,data = cdlib.decode(ev[7])
    if hops and src and dst and data then
     if not fcache[src] then
      log("fcache["..tostring(src).."] = "..tostring(ev[3]))
-     fcache[src] = {ev[2],ev[3],os.time()}
+     fcache[src] = {ev[2],ev[3],computer.uptime()}
     end
     if not pt[ev[7]:sub(2)] then
-     pt[ev[7]:sub(2)] = os.time()
+     pt[ev[7]:sub(2)] = computer.uptime()
      if dst == net.id then
       event.push("net_rmsg",src,data)
       local pd = relib.decode(data)
@@ -89,7 +89,7 @@ spawn("copperd",function() print(xpcall(function ()
    end
   end
   for k,v in pairs(ps) do
-   if v.lt < os.time()-1 then
+   if v.lt < computer.uptime()-1 then
     if fcache[v.nid] and net.cache then
      local lma = fcache[v.nid][1]
      local rma = fcache[v.nid][2]
@@ -100,14 +100,14 @@ spawn("copperd",function() print(xpcall(function ()
      end
     end
     v.at = v.at + 1
-    v.lt = os.time()
+    v.lt = computer.uptime()
     if v.pt == 2 then ps[k] = nil end
    end
    if v.at > 255 then
     ps[k] = nil
    end
   end
-  local cot = os.time()
+  local cot = computer.uptime()
   for k,v in pairs(pt) do
    if v < cot-16 then
     pt[k] = nil
diff --git a/modules/util/logflush.lua b/modules/util/logflush.lua
index ccfdb69..45c7332 100644
--- a/modules/util/logflush.lua
+++ b/modules/util/logflush.lua
@@ -1,7 +1,7 @@
 spawn("logflushd",function()
- local lt = os.time()
+ local lt = computer.uptime()
  while true do
-  if os.time() > lt + 60 and Log:len() > 0 then
+  if computer.uptime() > lt + 60 and Log:len() > 0 then
    local f = fs.open("/tmp/sys.log","ab")
    if f then
     for i = 1, #Log, 1024 do