diff --git a/owlps-positioner/src/timestamp.cc b/owlps-positioner/src/timestamp.cc
index b05bd3b..97b1d1b 100644
--- a/owlps-positioner/src/timestamp.cc
+++ b/owlps-positioner/src/timestamp.cc
@@ -148,7 +148,7 @@ bool Timestamp::equals(const uint64_t source) const
 }
 
 
-bool Timestamp::less_than(const struct timespec &source) const
+bool Timestamp::before(const struct timespec &source) const
 {
   if (timestamp.tv_sec < source.tv_sec)
     return true ;
@@ -164,11 +164,11 @@ bool Timestamp::less_than(const struct timespec &source) const
 }
 
 
-bool Timestamp::greater_than(const struct timespec &source) const
+bool Timestamp::after(const struct timespec &source) const
 {
   if (equals(source))
     return false ;
-  return ! less_than(source) ;
+  return ! before(source) ;
 }
 
 
diff --git a/owlps-positioner/src/timestamp.hh b/owlps-positioner/src/timestamp.hh
index 5d312cd..84cb1e3 100644
--- a/owlps-positioner/src/timestamp.hh
+++ b/owlps-positioner/src/timestamp.hh
@@ -39,8 +39,8 @@ protected:
   bool equals(const struct timespec &source) const ;
   /// Compares to a millisecond value (deprecated)
   bool equals(const uint64_t source) const ;
-  bool less_than(const struct timespec &source) const ;
-  bool greater_than(const struct timespec &source) const ;
+  bool before(const struct timespec &source) const ;
+  bool after(const struct timespec &source) const ;
   //@}
 
   /** @name Operations */
@@ -171,13 +171,13 @@ inline bool Timestamp::operator!=(const uint64_t source) const
 
 inline bool Timestamp::operator<(const Timestamp &source) const
 {
-  return less_than(source.timestamp) ;
+  return before(source.timestamp) ;
 }
 
 
 inline bool Timestamp::operator<(const struct timespec &source) const
 {
-  return less_than(source) ;
+  return before(source) ;
 }
 
 
@@ -189,13 +189,13 @@ inline bool Timestamp::operator<(const uint64_t source) const
 
 inline bool Timestamp::operator>(const Timestamp &source) const
 {
-  return greater_than(source.timestamp) ;
+  return after(source.timestamp) ;
 }
 
 
 inline bool Timestamp::operator>(const struct timespec &source) const
 {
-  return greater_than(source) ;
+  return after(source) ;
 }