fix time to nano-seconds conversion routines

examples/BskSim/scenarios/scenario_AttModes.py

@@ -145,7 +145,7 @@ def runScenario(scenario):
     attitudeModeTime = macros.min2nano(10.)
     attitudeMode = ["hillPoint", "inertial3D"]
 
-    currentSimulationTime = 0.
+    currentSimulationTime = 0
     while currentSimulationTime < simulationTime:
 
         # Configure alternating FSW mode

src/utilities/macros.py

@@ -21,25 +21,30 @@
 
 import math
 
+
 #   function to convert seconds to an integer nanoseconds value
 def sec2nano(time):
     """convert seconds to nano-seconds"""
     return int(time*1E9+0.5)
 
+
 #   function to convert minutes to an integer nanoseconds value
 def min2nano(time):
     "convert minutes to nano-seconds"
-    return int((time*1E9+0.5)*60)
+    return int(time*1E9*60 + 0.5)
+
 
 #   function to convert hours to an integer nanoseconds value
 def hour2nano(time):
     """convert hours to nano-seconds"""
-    return int((time*1E9+0.5)*60*60)
+    return int(time*1E9*60*60 + 0.5)
+
 
 #   function to convert days to an integer nanoseconds value
 def day2nano(time):
     """convert days to nano-seconds"""
-    return int((time*1E9+0.5)*60*60*24)
+    return int(time*1E9*60*60*24 + 0.5)
+
 
 #   variable to convert nano-seconds to seconds
 NANO2SEC = 1E-9