diff --git a/src/main/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterService.java b/src/main/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterService.java
index 175cb279..8820b371 100644
--- a/src/main/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterService.java
+++ b/src/main/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterService.java
@@ -85,8 +85,8 @@ void shiftDates(Base baseResource, int shiftBy) {
                 ZonedDateTime shifted = date.atZone(ZoneId.of("UTC")).plusYears(shiftBy);
                 if (shifted.getYear() > 9999) {
                   dateType.setValue(DateUtils.setYears(dateType.getValue(), 9999));
-                } else if (shifted.getYear() < 0) {
-                  dateType.setValue(DateUtils.setYears(dateType.getValue(), 1));
+                } else if (shifted.getYear() < 1900) {
+                  dateType.setValue(DateUtils.setYears(dateType.getValue(), 1900));
                 } else {
                   dateType.add(1, shiftBy);
                 }
diff --git a/src/test/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterServiceTest.java b/src/test/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterServiceTest.java
index 60bd0b9a..040b333a 100644
--- a/src/test/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterServiceTest.java
+++ b/src/test/java/gov/cms/madie/madiefhirservice/services/TestCaseDateShifterServiceTest.java
@@ -278,6 +278,6 @@ void limitsLowerYearRangeTo0() {
     Date originalBirthDate = (Date) patient.getBirthDate().clone();
     int shiftBy = -1000000; // years
     testCaseDateShifterService.shiftDates(patient, shiftBy);
-    assertEquals(DateUtils.setYears(originalBirthDate, 1), patient.getBirthDate());
+    assertEquals(DateUtils.setYears(originalBirthDate, 1900), patient.getBirthDate());
   }
 }