agm-dateformat/src/index.js

A simple date formatting library

const agmFormatDate = (dateInput, format = 'dd/mm/yyyy') => {
    let date;

    function parseDate(input) {
        const parsedDate = new Date(input);
        if (isNaN(parsedDate.getTime())) {
            throw new Error('Invalid date');
        }
        return parsedDate;
    }

    if (typeof dateInput === 'string') {
        date = parseDate(dateInput);
    } else if (typeof dateInput === 'number') {
        date = new Date(dateInput);
    } else if (dateInput instanceof Date) {
        date = dateInput;
    } else {
        throw new Error('Unsupported date format');
    }

    if (isNaN(date.getTime())) {
        throw new Error('Invalid date');
    }

    const day = String(date.getUTCDate()).padStart(2, '0');
    const month = date.toLocaleString('default', { month: 'short' });
    const monthFull = date.toLocaleString('default', { month: 'long' });
    const monthNumber = String(date.getUTCMonth() + 1).padStart(2, '0');
    const year = date.getUTCFullYear();
    const yearShort = String(year).slice(-2);
    const hours24 = date.getUTCHours();
    const minutes = String(date.getUTCMinutes()).padStart(2, '0');
    const ampm = hours24 >= 12 ? 'PM' : 'AM';
    const hours12 = hours24 % 12 || 12;
    const weekday = date.toLocaleDateString('en-US', { weekday: 'long' });

    switch (format) {
        case 'dd-mm-yyyy':
            return `${day}-${monthNumber}-${year}`;
        case 'dd/mm/yyyy':
            return `${day}/${monthNumber}/${year}`;
        case 'dd mmm yyyy':
            return `${day} ${month} ${year}`;
        case 'mmm dd yyyy':
            return `${monthFull} ${day} ${year}`;
        case 'ddd tt':
            return `${date.toLocaleDateString('en-US', { weekday: 'short' })} ${hours12}:${minutes} ${ampm}`;
        case 'mmm dd':
            return `${month}-${day}`;
        case 'dddd dd mmm yyyy':
            return `${weekday}, ${day} ${monthFull} ${year}`;
        case 'dd-mm-yy':
            return `${day}-${monthNumber}-${yearShort}`;
        case 'dd/mm/yy':
            return `${day}/${monthNumber}/${yearShort}`;
        case 'dd/mm/yyyy tt':
            return `${day}/${monthNumber}/${year} ${hours24}:${minutes} ${ampm}`;
        case 'dd-mm-yyyy tt':
            return `${day}-${monthNumber}-${year} ${hours12}:${minutes} ${ampm}`;
        default:
            throw new Error('Unsupported format');
    }
}

export default agmFormatDate;