Fix average time of this month (#149)

Author: sheepzh

package.json

@@ -1,6 +1,6 @@
 {
   "name": "timer",
-  "version": "1.2.6",
+  "version": "1.2.7",
   "description": "Web timer",
   "homepage": "https://github.com/sheepzh/timer",
   "scripts": {

src/popup/components/footer/index.ts

@@ -36,23 +36,25 @@ function calculateDateRange(duration: timer.popup.Duration, weekStart: timer.opt
         if (weekStartAsNormal) {
             return getWeekTime(now, locale === 'zh_CN')
         } else {
+            const weekOffset: number = weekStart as number
             // Returns 0 - 6 means Monday to Sunday
             const weekDayNow = getWeekDay(now, true)
             const optionWeekDay = weekDayNow + 1
             let start: Date = undefined
             if (optionWeekDay === weekStart) {
                 start = now
             } else if (optionWeekDay < weekStart) {
-                const millDelta = (optionWeekDay + 7 - weekStart) * MILL_PER_DAY
+                const millDelta = (optionWeekDay + 7 - weekOffset) * MILL_PER_DAY
                 start = new Date(now.getTime() - millDelta)
             } else {
-                const millDelta = (optionWeekDay - weekStart) * MILL_PER_DAY
+                const millDelta = (optionWeekDay - weekOffset) * MILL_PER_DAY
                 start = new Date(now.getTime() - millDelta)
             }
             return [start, now]
         }
     } else if (duration == 'thisMonth') {
-        return getMonthTime(now)
+        const startOfMonth = getMonthTime(now)[0]
+        return [startOfMonth, now]
     }
 }