public string[] GetMonthNames(MonthStyle style)
{
Dictionary <string, string[]> dictionary = GetMonthNames();
switch (style)
{
case MonthStyle.Short:
return((string[])dictionary["short"].Clone());
case MonthStyle.Narrow:
return((string[])dictionary["narrow"].Clone());
default:
return((string[])dictionary["long"].Clone());
}
}
private static string ParseDateTimeFormat(string format, out DateTimePartStyles style)
{
WeekdayStyle weekday = default;
EraStyle era = default;
MonthStyle month = default;
NumericDateTimePartStyle year = default;
NumericDateTimePartStyle day = default;
NumericDateTimePartStyle hour = default;
NumericDateTimePartStyle minute = default;
NumericDateTimePartStyle second = default;
TimeZoneNameStyle timeZoneName = default;
bool isHour12 = false;
string pattern = Regex.Replace(format, "('([^']*)'|(?<d>[yMLdGEcabBhHkKmszv])(\\k<d>)*)", m => {
switch (m.Value[0])
{
case 'y':
year = m.Length == 2 ? NumericDateTimePartStyle.TwoDigit : NumericDateTimePartStyle.Numeric;
return("{year}");
case 'M':
case 'L':
switch (m.Length)
{
case 1:
month = MonthStyle.Numeric;
break;
case 2:
month = MonthStyle.TwoDigit;
break;
case 3:
month = MonthStyle.Short;
break;
case 4:
month = MonthStyle.Long;
break;
case 5:
month = MonthStyle.Narrow;
break;
}
return("{month}");
case 'd':
day = m.Length == 2 ? NumericDateTimePartStyle.TwoDigit : NumericDateTimePartStyle.Numeric;
return("{day}");
case 'E':
case 'c':
weekday = m.Length == 2 ? WeekdayStyle.Short : m.Length == 3 ? WeekdayStyle.Long : WeekdayStyle.Narrow;
return("{weekday}");
case 'G':
era = EraStyle.Long;
return("{era}");
case 'a':
case 'b':
case 'B':
isHour12 = true;
return("{ampm}");
case 'h':
case 'H':
case 'k':
case 'K':
hour = m.Length == 2 ? NumericDateTimePartStyle.TwoDigit : NumericDateTimePartStyle.Numeric;
return("{hour}");
case 'm':
minute = m.Length == 2 ? NumericDateTimePartStyle.TwoDigit : NumericDateTimePartStyle.Numeric;
return("{minute}");
case 's':
second = m.Length == 2 ? NumericDateTimePartStyle.TwoDigit : NumericDateTimePartStyle.Numeric;
return("{second}");
case 'z':
case 'v':
timeZoneName = m.Length == 1 ? TimeZoneNameStyle.Short : TimeZoneNameStyle.Long;
return("{timeZoneName}");
}
return(m.Length == 2 ? "'" : m.Groups[1].Value);
});
style = new DateTimePartStyles(weekday, era, year, month, day, hour, minute, second, timeZoneName, isHour12);
return(pattern);
}
public DateTimePartStyles(WeekdayStyle weekday, EraStyle era, NumericDateTimePartStyle year, MonthStyle month, NumericDateTimePartStyle day, NumericDateTimePartStyle hour, NumericDateTimePartStyle minute, NumericDateTimePartStyle second, TimeZoneNameStyle timeZoneName, bool isHour12)
{
int value = 0;
value |= (int)weekday << 0;
value |= (int)era << 3;
value |= (int)year << 6;
value |= (int)month << 9;
value |= (int)day << 12;
value |= (int)hour << 15;
value |= (int)minute << 18;
value |= (int)second << 21;
value |= (int)timeZoneName << 24;
value |= isHour12 ? 1 << 27 : 0;
this.value = value;
}