hossein-por-shop/frontend/composables/global/usePersianDate.ts

// composables/usePersianDate.ts
import { format } from "date-fns-jalali";
import { faIR } from "date-fns-jalali/locale";
import { Jalali } from "jalali-ts";

export default function usePersianDate() {
    const formatToPersian = (isoDate: string): string => {
        try {
            const yearStr = isoDate.slice(0, 4);
            const year = Number(yearStr);

            // jDateTimeField from django_jalali sends Jalali years (13XX/14XX).
            // Normal DateTimeField sends Gregorian (19XX/20XX). Detect by year
            // and use jalali-ts to convert when needed — date-fns-jalali's
            // parseISO doesn't actually do calendar conversion.
            const date =
                !Number.isNaN(year) && year < 1700
                    ? Jalali.parse(isoDate).date
                    : new Date(isoDate);

            if (isNaN(date.getTime())) return "Invalid date";

            const persianDate = format(date, "yyyy/MM/dd", { locale: faIR });

            const persianTime = format(date, "HH:mm", { locale: faIR });

            return `${persianDate} | ${persianTime}`;
        } catch (error) {
            return "Invalid date";
        }
    };

    return {
        formatToPersian,
    };
}