migrate lib/datetime.js to ts

src/components/desktop/DateRangeSelectionDialog.vue

@@ -73,7 +73,7 @@ import {
     getTimezoneOffsetMinutes,
     getBrowserTimezoneOffsetMinutes,
     getDateRangeByDateType
-} from '@/lib/datetime.js';
+} from '@/lib/datetime.ts';
 
 export default {
     props: [

src/components/desktop/DateTimeSelect.vue

@@ -52,7 +52,7 @@ import {
     getLocalDatetimeFromUnixTime,
     getActualUnixTimeForStore,
     getUnixTime
-} from '@/lib/datetime.js';
+} from '@/lib/datetime.ts';
 
 export default {
     props: [

src/components/desktop/MonthRangeSelectionDialog.vue

@@ -78,7 +78,7 @@ import {
     getThisYearFirstUnixTime,
     getYearMonthFirstUnixTime,
     getYearMonthLastUnixTime
-} from '@/lib/datetime.js';
+} from '@/lib/datetime.ts';
 
 export default {
     props: [

src/components/desktop/TrendsChart.vue

@@ -22,7 +22,7 @@ import {
     getYearMonthFirstUnixTime,
     getYearMonthLastUnixTime,
     getDateTypeByDateRange
-} from '@/lib/datetime.js';
+} from '@/lib/datetime.ts';
 import {
     sortStatisticsItems,
     getAllDateRanges