60 lines
1.9 KiB
TypeScript
60 lines
1.9 KiB
TypeScript
import { ISO_DATE_LENGTH, ISO_DATE_START } from '../../common/time';
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const UTC_MONTH_INDEX_OFFSET = 1;
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const NEXT_DAY_OFFSET = 1;
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const MOSCOW_UTC_OFFSET_HOURS = 3;
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export type DateOnlyRange = { from: string; to: string };
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const moscow = 'Europe/Moscow';
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const moscowFormatter = new Intl.DateTimeFormat('en-CA', {
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timeZone: moscow,
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year: 'numeric',
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month: '2-digit',
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day: '2-digit',
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});
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export function moscowDate(value: Date): string {
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const parts = moscowFormatter.formatToParts(value);
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const get = (type: string) => parts.find((part) => part.type === type)?.value;
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return `${get('year')}-${get('month')}-${get('day')}`;
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}
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// Inclusive Moscow calendar dates become a half-open instant range, capped at now.
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export function dateOnlyBounds(
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range: DateOnlyRange,
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now = new Date(),
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): { from: Date; to: Date } {
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const from = dateParts(range.from);
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const end = dateParts(range.to);
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const to = new Date(
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Date.UTC(end[0], end[1] - UTC_MONTH_INDEX_OFFSET, end[2] + NEXT_DAY_OFFSET, -MOSCOW_UTC_OFFSET_HOURS),
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);
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return {
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from: new Date(
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Date.UTC(from[0], from[1] - UTC_MONTH_INDEX_OFFSET, from[2], -MOSCOW_UTC_OFFSET_HOURS),
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),
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to: to > now ? now : to,
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};
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}
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export function dateParts(value: string): [number, number, number] {
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const match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value);
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if (!match) throw new Error('Invalid date');
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const parts = [Number(match[1]), Number(match[2]), Number(match[3])] as [
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number,
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number,
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number,
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];
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if (utcDate(value).toISOString().slice(ISO_DATE_START, ISO_DATE_LENGTH) !== value) {
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throw new Error('Invalid date');
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}
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return parts;
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}
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export function utcDate(value: string): Date {
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const match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value);
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if (!match) return new Date(NaN);
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return new Date(
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Date.UTC(Number(match[1]), Number(match[2]) - UTC_MONTH_INDEX_OFFSET, Number(match[3])),
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);
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}
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