private static string DateTimeToString(DateTime bi)
{
DateTime dt = TimeZoneInfo.ConvertTime(bi, TimeZoneInfo.Utc);
int year = dt.Year;
int month = dt.Month;
int day = dt.Day;
int hour = dt.Hour;
int minute = dt.Minute;
int second = dt.Second;
int millisecond = dt.Millisecond;
var charbuf = new char[millisecond > 0 ? 24 : 20];
charbuf[0] = (char)('0' + ((year / 1000) % 10));
charbuf[1] = (char)('0' + ((year / 100) % 10));
charbuf[2] = (char)('0' + ((year / 10) % 10));
charbuf[3] = (char)('0' + (year % 10));
charbuf[4] = '-';
charbuf[5] = (char)('0' + ((month / 10) % 10));
charbuf[6] = (char)('0' + (month % 10));
charbuf[7] = '-';
charbuf[8] = (char)('0' + ((day / 10) % 10));
charbuf[9] = (char)('0' + (day % 10));
charbuf[10] = 'T';
charbuf[11] = (char)('0' + ((hour / 10) % 10));
charbuf[12] = (char)('0' + (hour % 10));
charbuf[13] = ':';
charbuf[14] = (char)('0' + ((minute / 10) % 10));
charbuf[15] = (char)('0' + (minute % 10));
charbuf[16] = ':';
charbuf[17] = (char)('0' + ((second / 10) % 10));
charbuf[18] = (char)('0' + (second % 10));
if (millisecond > 0) {
charbuf[19] = '.';
charbuf[20] = (char)('0' + ((millisecond / 100) % 10));
charbuf[21] = (char)('0' + ((millisecond / 10) % 10));
charbuf[22] = (char)('0' + (millisecond % 10));
charbuf[23] = 'Z';
} else {
charbuf[19] = 'Z';
}
return new String(charbuf);
}
