Use DateTime.UtcNow for timestamps

Author: bahusoid

src/NHibernate/Cache/NoCacheProvider.cs

@@ -41,7 +41,7 @@ public long NextTimestamp()
 			// This is used by SessionFactoryImpl to hand to the generated SessionImpl;
 			// was the only reason I could see that we cannot just use null as
 			// Settings.CacheProvider
-			return DateTime.Now.Ticks / (100 * TimeSpan.TicksPerMillisecond);
+			return DateTime.UtcNow.Ticks / (100 * TimeSpan.TicksPerMillisecond);
 		}
 
 		/// <summary>

src/NHibernate/Cache/Timestamper.cs

@@ -34,7 +34,7 @@ public static long Next()
 			{
 				// Ticks is accurate down to 100 nanoseconds - hibernate uses milliseconds
 				// to help calculate next time so drop the nanoseconds portion.(1ms==1000000ns)
-				long newTime = ((DateTime.Now.Ticks / 10000) - baseDateMs) << BinDigits;
+				long newTime = ((DateTime.UtcNow.Ticks / 10000) - baseDateMs) << BinDigits;
 				if (time < newTime)
 				{
 					time = newTime;
@@ -48,4 +48,4 @@ public static long Next()
 			}
 		}
 	}
-}
+}

src/NHibernate/Id/CounterGenerator.cs

@@ -33,7 +33,7 @@ public object Generate(ISessionImplementor cache, object obj)
 			// one year Count only serves to avoid collision for entities persisted in the same 100ns. Maybe it should
 			// have been (DateTime.Now.Ticks && 0xffff) instead, with count serving to avoid collision for up to 37767
 			// entities in the same 6.5535ms. But changing this would be a breaking change for existing values.
-			return unchecked ((DateTime.Now.Ticks << 16) + Count);
+			return unchecked ((DateTime.UtcNow.Ticks << 16) + Count);
 		}
 	}
 }