diff --git a/BollingerBands.js b/BollingerBands.js
index 4a8683baa..3a5950ede 100644
--- a/BollingerBands.js
+++ b/BollingerBands.js
@@ -335,7 +335,7 @@
 
             while (currentDate.valueOf() <= farRightDate.valueOf() + ONE_DAY_IN_MILISECONDS) {
 
-                let stringDate = currentDate.getFullYear() + '-' + pad(currentDate.getMonth() + 1, 2) + '-' + pad(currentDate.getDate(), 2);
+                let stringDate = currentDate.getUTCFullYear() + '-' + pad(currentDate.getUTCMonth() + 1, 2) + '-' + pad(currentDate.getUTCDate(), 2);
 
                 let dailyFile = fileCursor.files.get(stringDate);
 
diff --git a/PercentageBandwidth.js b/PercentageBandwidth.js
index c32569874..0f38df5b2 100644
--- a/PercentageBandwidth.js
+++ b/PercentageBandwidth.js
@@ -315,7 +315,7 @@
 
             while (currentDate.valueOf() <= farRightDate.valueOf() + ONE_DAY_IN_MILISECONDS) {
 
-                let stringDate = currentDate.getFullYear() + '-' + pad(currentDate.getMonth() + 1, 2) + '-' + pad(currentDate.getDate(), 2);
+                let stringDate = currentDate.getUTCFullYear() + '-' + pad(currentDate.getUTCMonth() + 1, 2) + '-' + pad(currentDate.getUTCDate(), 2);
 
                 let dailyFile = fileCursor.files.get(stringDate);