diff --git a/src/Calculators/AnnuityCalculator.php b/src/Calculators/AnnuityCalculator.php
index 72f549c..b9e701b 100644
--- a/src/Calculators/AnnuityCalculator.php
+++ b/src/Calculators/AnnuityCalculator.php
@@ -128,21 +128,21 @@ public function getAnnuityNoOfCompoundingPeriods() {
          * @return string
          */
         public function getAnnuityPeriodLengthInYears() {
-            return $this->annuityPeriodLength->asYears();
+            return $this->annuityPeriodLength->toYears();
         }
 
         /**
          * @return string
          */
         public function getAnnuityPeriodLengthInMonths() {
-            return $this->annuityPeriodLength->asMonths();
+            return $this->annuityPeriodLength->toMonths();
         }
 
         /**
          * @return mixed
          */
         public function getAnnuityPeriodLengthInDays() {
-            return $this->annuityPeriodLength->asDays();
+            return $this->annuityPeriodLength->toDays();
         }
 
         /**
diff --git a/src/Utils/Time/TimeSpan.php b/src/Utils/Time/TimeSpan.php
index 63772a6..1852e8a 100644
--- a/src/Utils/Time/TimeSpan.php
+++ b/src/Utils/Time/TimeSpan.php
@@ -154,7 +154,7 @@ public function getDaysComponent() {
          * @return string
          * @throws Exception
          */
-        public function asYears() {
+        public function toYears() {
             $monthsComponent = MathFuncs::div(
                 $this->getMonthsComponent(),
                 12
@@ -173,7 +173,7 @@ public function asYears() {
          * @return string
          * @throws Exception
          */
-        public function asMonths() {
+        public function toMonths() {
             $yearsComponent = MathFuncs::mul($this->getYearsComponent(), 12);
             $daysComponent = TimeUtils::getCurrentDayCountConvention()['days_in_a_month'] == 0 ?
                 0 :
@@ -189,7 +189,7 @@ public function asMonths() {
          * @return string
          * @throws Exception
          */
-        public function asDays() {
+        public function toDays() {
             $yearsComponent = MathFuncs::mul(
                 $this->getYearsComponent(),
                 TimeUtils::getCurrentDayCountConvention()['days_in_a_year']
@@ -278,7 +278,7 @@ private function roundDateInterval(DateInterval $dateInterval) {
          * @return string
          */
         public function __toString() {
-            return $this->asDays();
+            return $this->toDays();
         }
     }
 }
\ No newline at end of file
diff --git a/tests/TimeUtilsTest.php b/tests/TimeUtilsTest.php
index 392c969..f75e5cd 100644
--- a/tests/TimeUtilsTest.php
+++ b/tests/TimeUtilsTest.php
@@ -15,15 +15,15 @@ class TimeUtilsTest extends PHPUnit_Framework_TestCase {
     private $DAYS = 360;
 
     public function testYearsFromTimeSpan() {
-        $this->assertEquals(1.75, $this->timeSpan->asYears());
+        $this->assertEquals(1.75, $this->timeSpan->toYears());
     }
 
     public function testMonthsFromTimeSpan() {
-        $this->assertEquals(21, $this->timeSpan->asMonths());
+        $this->assertEquals(21, $this->timeSpan->toMonths());
     }
 
     public function testDaysFromTimeSpan() {
-        $this->assertEquals(630, $this->timeSpan->asDays());
+        $this->assertEquals(630, $this->timeSpan->toDays());
     }
 
     public function testGetYearsFromDays() {