Revert 114499 - Simplify PRTimeToBaseTime implementation, add BaseTimeToPRTime.

crypto/nss_util.cc

Index: crypto/nss_util.cc
===================================================================
--- crypto/nss_util.cc	(revision 114522)
+++ crypto/nss_util.cc	(working copy)
@@ -769,13 +769,23 @@
 }
 #endif  // defined(OS_CHROMEOS)
 
+// TODO(port): Implement this more simply.  We can convert by subtracting an
+// offset (the difference between NSPR's and base::Time's epochs).
 base::Time PRTimeToBaseTime(PRTime prtime) {
-  return base::Time::FromInternalValue(
-      prtime + base::Time::UnixEpoch().ToInternalValue());
-}
+  PRExplodedTime prxtime;
+  PR_ExplodeTime(prtime, PR_GMTParameters, &prxtime);
 
-PRTime BaseTimeToPRTime(base::Time time) {
-  return time.ToInternalValue() - base::Time::UnixEpoch().ToInternalValue();
+  base::Time::Exploded exploded;
+  exploded.year         = prxtime.tm_year;
+  exploded.month        = prxtime.tm_month + 1;
+  exploded.day_of_week  = prxtime.tm_wday;
+  exploded.day_of_month = prxtime.tm_mday;
+  exploded.hour         = prxtime.tm_hour;
+  exploded.minute       = prxtime.tm_min;
+  exploded.second       = prxtime.tm_sec;
+  exploded.millisecond  = prxtime.tm_usec / 1000;
+
+  return base::Time::FromUTCExploded(exploded);
 }
 
 PK11SlotInfo* GetPublicNSSKeySlot() {