All files / helpers date.ts

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const RUSSIAN_LOCALE = 'ru-RU';
 
export function isSameDay(a: Date, b: Date): boolean {
    return a.getDate() === b.getDate() && a.getMonth() === b.getMonth() && a.getFullYear() === b.getFullYear();
}
 
export function formatTime(date: Date): string {
    return date.toLocaleTimeString(RUSSIAN_LOCALE, {
        hour: '2-digit',
        minute: '2-digit',
    });
}
 
export function formatDateHeader(date: Date, referenceDate = new Date()): string {
    const yesterday = new Date(referenceDate);
    yesterday.setDate(yesterday.getDate() - 1);
 
    if (isSameDay(date, referenceDate)) {
        return 'Сегодня';
    }
    if (isSameDay(date, yesterday)) {
        return 'Вчера';
    }
 
    return date.toLocaleDateString(RUSSIAN_LOCALE, {
        day: 'numeric',
        month: 'long',
        year: date.getFullYear() !== referenceDate.getFullYear() ? 'numeric' : undefined,
    });
}