fredericandterraputix
9946cd5851
Co-authored-by: terraputix <terraputix@mailbox.org> Reviewed-on: useweb/open-meteo-blue#7
62 lines
2.1 KiB
TypeScript
62 lines
2.1 KiB
TypeScript
import { formatInTimeZone, toZonedTime } from 'date-fns-tz';
|
|
import { isSameDay as isSameDayDateFns } from 'date-fns';
|
|
|
|
/**
|
|
* Formats a UTC Date into a string for a specific timezone using date-fns patterns.
|
|
* Patterns: 'HH:mm' for 24h time, 'EEE' for short weekday, etc.
|
|
*/
|
|
export function formatZoned(date: Date, timeZone: string, pattern: string): string {
|
|
return formatInTimeZone(date, timeZone, pattern);
|
|
}
|
|
|
|
/**
|
|
* Checks if two dates are the same day in a specific timezone.
|
|
* Important for comparing weather forecast days against a selected date.
|
|
*/
|
|
export function isSameDayInZone(date1: Date, date2: Date, timeZone: string): boolean {
|
|
const z1 = toZonedTime(date1, timeZone);
|
|
const z2 = toZonedTime(date2, timeZone);
|
|
return isSameDayDateFns(z1, z2);
|
|
}
|
|
|
|
/**
|
|
* Gets the numeric hour (0-23) for a date in a specific timezone.
|
|
*/
|
|
export function getZonedHour(date: Date, timeZone: string): number {
|
|
return parseInt(formatInTimeZone(date, timeZone, 'H'), 10);
|
|
}
|
|
|
|
/**
|
|
* Returns a relative label like "Today", "Tomorrow", "Yesterday",
|
|
* or a formatted date string, all relative to the target timezone.
|
|
*/
|
|
export function getRelativeDayLabel(date: Date, timeZone: string): string {
|
|
const now = new Date();
|
|
const zonedDate = toZonedTime(date, timeZone);
|
|
const zonedNow = toZonedTime(now, timeZone);
|
|
|
|
if (isSameDayDateFns(zonedDate, zonedNow)) return 'Today';
|
|
|
|
const tomorrow = new Date(zonedNow);
|
|
tomorrow.setDate(tomorrow.getDate() + 1);
|
|
if (isSameDayDateFns(zonedDate, tomorrow)) return 'Tomorrow';
|
|
|
|
const yesterday = new Date(zonedNow);
|
|
yesterday.setDate(yesterday.getDate() - 1);
|
|
if (isSameDayDateFns(zonedDate, yesterday)) return 'Yesterday';
|
|
|
|
return formatInTimeZone(date, timeZone, 'EEE d MMM');
|
|
}
|
|
|
|
/**
|
|
* Formats a UTC offset in seconds to a string like "UTC+1" or "UTC-05:00"
|
|
*/
|
|
export function formatUtcOffset(offsetSeconds: number): string {
|
|
const sign = offsetSeconds >= 0 ? '+' : '-';
|
|
const abs = Math.abs(offsetSeconds);
|
|
const hours = Math.floor(abs / 3600);
|
|
const minutes = Math.floor((abs % 3600) / 60);
|
|
const pad = (n: number) => n.toString().padStart(2, '0');
|
|
return minutes === 0 ? `UTC${sign}${hours}` : `UTC${sign}${hours}:${pad(minutes)}`;
|
|
}
|