diff --git a/common/script/cron.js b/common/script/cron.js
new file mode 100644
index 0000000000..9dddeaaa7f
--- /dev/null
+++ b/common/script/cron.js
@@ -0,0 +1,16 @@
+/*
+  ------------------------------------------------------
+  Cron and time / day functions
+  ------------------------------------------------------
+ */
+
+export const DAY_MAPPING = {
+  0: 'su',
+  1: 'm',
+  2: 't',
+  3: 'w',
+  4: 'th',
+  5: 'f',
+  6: 's',
+};
+
diff --git a/common/script/index.js b/common/script/index.js
index 6a3558f937..c56d9b0f0d 100644
--- a/common/script/index.js
+++ b/common/script/index.js
@@ -1,3 +1,7 @@
+import {
+  DAY_MAPPING   // temporary, pending further refactoring
+} from '../../common/script/cron';
+
 var $w, _, api, content, i18n, moment, preenHistory, sanitizeOptions, sortOrder,
   indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };
 
@@ -113,17 +117,6 @@ api.startOfDay = function(options) {
   return dayStart;
 };
 
-api.dayMapping = {
-  0: 'su',
-  1: 'm',
-  2: 't',
-  3: 'w',
-  4: 'th',
-  5: 'f',
-  6: 's'
-};
-
-
 /*
   Absolute diff from "yesterday" till now
  */
@@ -175,7 +168,7 @@ api.shouldDo = function(day, dailyTask, options) {
       return false;
     }
     dayOfWeekNum = startOfDayWithCDSTime.day();
-    dayOfWeekCheck = dailyTask.repeat[api.dayMapping[dayOfWeekNum]];
+    dayOfWeekCheck = dailyTask.repeat[DAY_MAPPING[dayOfWeekNum]];
     return dayOfWeekCheck;
   } else {
     return false;
diff --git a/test/common/algos.mocha.js b/test/common/algos.mocha.js
index af902bd46c..c10e18c6d7 100644
--- a/test/common/algos.mocha.js
+++ b/test/common/algos.mocha.js
@@ -1,4 +1,8 @@
 /* eslint-disable camelcase, func-names, no-shadow */
+import {
+  DAY_MAPPING,
+} from '../../common/script/cron';
+
 let expect = require('expect.js');
 let sinon = require('sinon');
 let moment = require('moment');
@@ -301,7 +305,7 @@ describe('User', () => {
 
     let yesterday = moment().subtract(1, 'days');
 
-    user.dailys[0].repeat[shared.dayMapping[yesterday.day()]] = false;
+    user.dailys[0].repeat[DAY_MAPPING[yesterday.day()]] = false;
     _.each(user.dailys.slice(1), (d) => {
       d.completed = true;
     });
@@ -383,7 +387,7 @@ describe('User', () => {
     it('does not reset checklist on grey incomplete dailies', () => {
       let yesterday = moment().subtract(1, 'days');
 
-      user.dailys[0].repeat[shared.dayMapping[yesterday.day()]] = false;
+      user.dailys[0].repeat[DAY_MAPPING[yesterday.day()]] = false;
       user.dailys[0].checklist = [
         {
           text: '1',
@@ -407,7 +411,7 @@ describe('User', () => {
     it('resets checklist on complete grey complete dailies', () => {
       let yesterday = moment().subtract(1, 'days');
 
-      user.dailys[0].repeat[shared.dayMapping[yesterday.day()]] = false;
+      user.dailys[0].repeat[DAY_MAPPING[yesterday.day()]] = false;
       user.dailys[0].checklist = [
         {
           text: '1',