Fix TT-TAI

The constant TT_MINUS_TAI_NSECS was being approximated by a double instead of using a long long, resulting small errors.
lsst · Sep 12, 2016 · 1d4d179 · 1d4d179
1 parent 9430b1c
commit 1d4d179
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Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/src/DateTime.cc b/src/DateTime.cc
@@ -77,7 +77,7 @@ static double const SEC_PER_DAY   = 86400.0;
 #endif
 
 // Difference between Terrestrial Time and TAI.
-static double const TT_MINUS_TAI_NSECS = 32184000000LL;
+static long long const TT_MINUS_TAI_NSECS = 32184000000LL;
 
 /* Leap second table as string.
  *

diff --git a/tests/dateTime.py b/tests/dateTime.py
@@ -116,6 +116,7 @@ def testIsoUTCBasic(self):
                 for decPt in (".", ","):  # "." or "," may be used as decimal point
                     dateStr = "2009{0}04{0}02T07{1}26{1}39{2}314159265Z".format(dateSep, timeSep, decPt)
                     ts = DateTime(dateStr, DateTime.UTC)
+                    self.assertEqual(ts.nsecs(DateTime.TT), long(1238657265498159265))
                     self.assertEqual(ts.nsecs(DateTime.TAI), long(1238657233314159265))
                     self.assertEqual(ts.nsecs(DateTime.UTC), long(1238657199314159265))
                     self.assertEqual(ts.toString(DateTime.UTC), "2009-04-02T07:26:39.314159265Z")