maya_long_date.dart

// Represents a date on the MLC calendar in format x.x.x.x.x
class MayaLongDate {

    // Number of days in each position
    static const List<int> moduli = [ 144000, 7200, 360, 20, 1 ];
    
    // Nunber of ms since 12/21/2012
    static DateTime MLC_EPOCH_13_START = DateTime.parse('2012-12-21T00:00:00+00:00');

    // Current date in MLC format - initialized to Baktun 13
    static List<int> mlc_date = [ 13, 0, 0, 0, 0 ];

    // Original DateTime object
    DateTime dt;

    MayaLongDate(this.dt) {
        
        DateTime normalized = DateTime(dt.year, dt.month, dt.day);
        Duration diff = normalized.difference(MLC_EPOCH_13_START);
        int days = diff.inDays;

        for (var i = 0; i != moduli.length; ++i) {

            if (days <= moduli[i]) continue;
            mlc_date[i] += (days / moduli[i]).floor();
            days %= moduli[i];
        }
    }

    @override // Returns date in X.X.X.X.X format
    String toString() { return mlc_date.join('.'); }
}