diff --git a/update_check_scheduler.cc b/update_check_scheduler.cc
index 4d088ab..cbe90c4 100644
--- a/update_check_scheduler.cc
+++ b/update_check_scheduler.cc
@@ -80,7 +80,7 @@
   }
   GTimeoutAddSeconds(interval, StaticCheck);
   scheduled_ = true;
-  LOG(INFO) << "Next update check in " << utils::SecsToHourMinSecStr(interval);
+  LOG(INFO) << "Next update check in " << utils::FormatSecs(interval);
 }
 
 gboolean UpdateCheckScheduler::StaticCheck(void* scheduler) {
diff --git a/utils.cc b/utils.cc
index 3232061..1cdcc5c 100644
--- a/utils.cc
+++ b/utils.cc
@@ -589,20 +589,40 @@
   return FALSE;
 }
 
-string SecsToHourMinSecStr(unsigned secs) {
-  // Canonicalize into hours, minutes, seconds.
-  unsigned hours = secs / (60 * 60);
-  secs -= hours * (60 * 60);
-  unsigned mins = secs / 60;
-  secs -= mins * 60;
+string FormatSecs(unsigned secs) {
+  return FormatTimeDelta(base::TimeDelta::FromSeconds(secs));
+}
+
+string FormatTimeDelta(base::TimeDelta delta) {
+  // Canonicalize into days, hours, minutes, seconds and microseconds.
+  unsigned days = delta.InDays();
+  delta -= base::TimeDelta::FromDays(days);
+  unsigned hours = delta.InHours();
+  delta -= base::TimeDelta::FromHours(hours);
+  unsigned mins = delta.InMinutes();
+  delta -= base::TimeDelta::FromMinutes(mins);
+  unsigned secs = delta.InSeconds();
+  delta -= base::TimeDelta::FromSeconds(secs);
+  unsigned usecs = delta.InMicroseconds();
 
   // Construct and return string.
   string str;
-  if (hours)
+  if (days)
+    base::StringAppendF(&str, "%ud", days);
+  if (days || hours)
     base::StringAppendF(&str, "%uh", hours);
-  if (hours || mins)
+  if (days || hours || mins)
     base::StringAppendF(&str, "%um", mins);
-  base::StringAppendF(&str, "%us", secs);
+  base::StringAppendF(&str, "%u", secs);
+  if (usecs) {
+    int width = 6;
+    while ((usecs / 10) * 10 == usecs) {
+      usecs /= 10;
+      width--;
+    }
+    base::StringAppendF(&str, ".%0*u", width, usecs);
+  }
+  base::StringAppendF(&str, "s");
   return str;
 }
 
diff --git a/utils.h b/utils.h
index 3c83674..7d64ee2 100644
--- a/utils.h
+++ b/utils.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -13,6 +13,7 @@
 #include <vector>
 
 #include <base/eintr_wrapper.h>
+#include <base/time.h>
 #include <ext2fs/ext2fs.h>
 #include <glib.h>
 
@@ -251,10 +252,19 @@
 // Assumes data points to a Closure. Runs it and returns FALSE;
 gboolean GlibRunClosure(gpointer data);
 
-// Converts seconds into hour-minute-second notation. For example, 185 will
-// yield 3m5s and 4300 will yield 1h11m40s. Zero padding not applied. Seconds
-// are always shown in the result.
-std::string SecsToHourMinSecStr(unsigned secs);
+// Converts seconds into human readable notation including days, hours, minutes
+// and seconds. For example, 185 will yield 3m5s, 4300 will yield 1h11m40s, and
+// 360000 will yield 4d4h0m0s.  Zero padding not applied. Seconds are always
+// shown in the result.
+std::string FormatSecs(unsigned secs);
+
+// Converts a TimeDelta into human readable notation including days, hours,
+// minutes, seconds and fractions of a second down to microsecond granularity,
+// as necessary; for example, an output of 5d2h0m15.053s means that the input
+// time was precise to the milliseconds only. Zero padding not applied, except
+// for fractions. Seconds are always shown, but fractions thereof are only shown
+// when applicable.
+std::string FormatTimeDelta(base::TimeDelta delta);
 
 }  // namespace utils