diff -r 3d3dcc3116d5 -r 5588347dfcbd DateUtils.m
--- a/DateUtils.m	Wed Apr 02 14:45:33 2008 -0700
+++ b/DateUtils.m	Wed May 07 16:47:44 2008 -0700
@@ -15,6 +15,22 @@
 #include <unistd.h>
 
 
+/** Absolute time (since 'reference date') to NSDate. 0.0 -> nil. */
+NSDate* $date( CFAbsoluteTime time )
+{
+    CAssert(time>=0.0 && time < 1.0e15, @"Bogus timestamp %g",time);
+    return time ?[NSDate dateWithTimeIntervalSinceReferenceDate: time] :nil;
+}
+
+
+/** NSDate to absolute time (since 'reference date'). nil -> 0.0 */
+CFAbsoluteTime $time( NSDate* date )
+{
+    return date ?[date timeIntervalSinceReferenceDate] :0.0;
+}
+
+
+
 NSTimeInterval TimeIntervalSinceBoot(void)
 {
     // From http://developer.apple.com/qa/qa2004/qa1398.html