use the daylight saving time zone as default time zone rather than the current standard time zone during the DST

src/components/common/DateTimePicker.vue

@@ -88,9 +88,9 @@ const {
     getCurrentNumeralSystemType,
     isLongDateMonthAfterYear,
     isLongTime24HourFormat,
-    getCalendarDisplayShortYearFromUnixTime,
-    getCalendarDisplayShortMonthFromUnixTime,
-    getCalendarDisplayDayOfMonthFromUnixTime,
+    getCalendarDisplayShortYearFromDateTime,
+    getCalendarDisplayShortMonthFromDateTime,
+    getCalendarDisplayDayOfMonthFromDateTime,
     getCalendarAlternateDate
 } = useI18n();
 
@@ -138,21 +138,21 @@ function switchView(viewType: MenuView): void {
 }
 
 function getDisplayYear(year: number): string {
-    return getCalendarDisplayShortYearFromUnixTime(getYearMonthDayDateTime(year, 1, 1).getUnixTime(), actualNumeralSystem.value);
+    return getCalendarDisplayShortYearFromDateTime(getYearMonthDayDateTime(year, 1, 1), actualNumeralSystem.value);
 }
 
 function getDisplayMonth(month: number): string {
     if (isArray(dateTime.value)) {
-        return getCalendarDisplayShortMonthFromUnixTime(getYearMonthDayDateTime(dateTime.value[0]!.getFullYear(), month + 1, 1).getUnixTime(), actualNumeralSystem.value);
+        return getCalendarDisplayShortMonthFromDateTime(getYearMonthDayDateTime(dateTime.value[0]!.getFullYear(), month + 1, 1), actualNumeralSystem.value);
     } else if (dateTime.value) {
-        return getCalendarDisplayShortMonthFromUnixTime(getYearMonthDayDateTime(dateTime.value.getFullYear(), month + 1, 1).getUnixTime(), actualNumeralSystem.value);
+        return getCalendarDisplayShortMonthFromDateTime(getYearMonthDayDateTime(dateTime.value.getFullYear(), month + 1, 1), actualNumeralSystem.value);
     } else {
-        return getCalendarDisplayShortMonthFromUnixTime(getYearMonthDayDateTime(new Date().getFullYear(), month + 1, 1).getUnixTime(), actualNumeralSystem.value);
+        return getCalendarDisplayShortMonthFromDateTime(getYearMonthDayDateTime(new Date().getFullYear(), month + 1, 1), actualNumeralSystem.value);
     }
 }
 
 function getDisplayDay(date: Date): string {
-    return getCalendarDisplayDayOfMonthFromUnixTime(getYearMonthDayDateTime(date.getFullYear(), date.getMonth() + 1, date.getDate()).getUnixTime(), actualNumeralSystem.value);
+    return getCalendarDisplayDayOfMonthFromDateTime(getYearMonthDayDateTime(date.getFullYear(), date.getMonth() + 1, date.getDate()), actualNumeralSystem.value);
 }
 
 defineExpose({

src/components/common/MonthPicker.vue

@@ -54,8 +54,8 @@ const emit = defineEmits<{
 
 const {
     isLongDateMonthAfterYear,
-    getCalendarDisplayShortYearFromUnixTime,
-    getCalendarDisplayShortMonthFromUnixTime
+    getCalendarDisplayShortYearFromDateTime,
+    getCalendarDisplayShortMonthFromDateTime
 } = useI18n();
 
 const yearRange = getAllowedYearRange();
@@ -96,14 +96,14 @@ function getYear0BasedMonthFromMonthSelectionValue(value: MonthSelectionValue):
 }
 
 function getDisplayYear(year: number): string {
-    return getCalendarDisplayShortYearFromUnixTime(getYearMonthDayDateTime(year, 1, 1).getUnixTime());
+    return getCalendarDisplayShortYearFromDateTime(getYearMonthDayDateTime(year, 1, 1));
 }
 
 function getDisplayMonth(month: number): string {
     if (isArray(dateTime.value)) {
-        return getCalendarDisplayShortMonthFromUnixTime(getYearMonthDayDateTime(dateTime.value[0]!.year, month + 1, 1).getUnixTime());
+        return getCalendarDisplayShortMonthFromDateTime(getYearMonthDayDateTime(dateTime.value[0]!.year, month + 1, 1));
     } else {
-        return getCalendarDisplayShortMonthFromUnixTime(getYearMonthDayDateTime(dateTime.value.year, month + 1, 1).getUnixTime());
+        return getCalendarDisplayShortMonthFromDateTime(getYearMonthDayDateTime(dateTime.value.year, month + 1, 1));
     }
 }
 </script>

src/components/common/TransactionCalendar.vue

@@ -38,14 +38,7 @@ import type { CalendarAlternateDate, TextualYearMonthDay, WeekDayValue } from '@
 import { INCOMPLETE_AMOUNT_SUFFIX } from '@/consts/numeral.ts';
 
 import { arrangeArrayWithNewStartIndex } from '@/lib/common.ts';
-import {
-    getTimezoneOffsetMinutes,
-    getBrowserTimezoneOffsetMinutes,
-    getUnixTimeFromLocalDatetime,
-    getActualUnixTimeForStore,
-    getYearMonthDayDateTime,
-    parseDateTimeFromUnixTime
-} from '@/lib/datetime.ts';
+import { getYearMonthDayDateTime } from '@/lib/datetime.ts';
 
 const props = defineProps<{
     modelValue: TextualYearMonthDay | '';
@@ -67,7 +60,7 @@ const emit = defineEmits<{
 const {
     getAllLongWeekdayNames,
     getAllShortWeekdayNames,
-    getCalendarDisplayDayOfMonthFromUnixTime,
+    getCalendarDisplayDayOfMonthFromDateTime,
     getCalendarAlternateDates,
     formatAmountToLocalizedNumeralsWithCurrency
 } = useI18n();
@@ -105,8 +98,7 @@ const alternateDates = computed<Record<TextualYearMonthDay, string> | undefined>
 });
 
 function noTransactionInMonthDay(date: Date): boolean {
-    const dateTime = parseDateTimeFromUnixTime(getActualUnixTimeForStore(getUnixTimeFromLocalDatetime(date), getTimezoneOffsetMinutes(), getBrowserTimezoneOffsetMinutes()));
-    return !props.dailyTotalAmounts || !props.dailyTotalAmounts[dateTime.getGregorianCalendarDay()];
+    return !props.dailyTotalAmounts || !props.dailyTotalAmounts[date.getDate()];
 }
 
 function getDisplayMonthTotalAmount(amount: number, currency: string | false, symbol: string, incomplete: boolean): string {
@@ -115,7 +107,7 @@ function getDisplayMonthTotalAmount(amount: number, currency: string | false, sy
 }
 
 function getDisplayDay(date: Date): string {
-    return getCalendarDisplayDayOfMonthFromUnixTime(getYearMonthDayDateTime(date.getFullYear(), date.getMonth() + 1, date.getDate()).getUnixTime());
+    return getCalendarDisplayDayOfMonthFromDateTime(getYearMonthDayDateTime(date.getFullYear(), date.getMonth() + 1, date.getDate()));
 }
 </script>