private static string GetMetaZoneName(string locale, string metaZone, TimeZoneNameStyle style, bool isDaylightSaving)
{
XElement metazoneNames = timeZones.XPathSelectElement(String.Format("/root/timeZoneNames[@locale = '{0}']/*[(local-name() = 'metazone' or local-name() = 'zone') and @type = '{1}']", locale, metaZone));
if (metazoneNames != null)
{
if (style == TimeZoneNameStyle.Short)
{
metazoneNames = metazoneNames.Element("short") ?? metazoneNames.Element("long");
}
else
{
metazoneNames = metazoneNames.Element("long");
}
XElement name = metazoneNames.Element(isDaylightSaving ? "daylight" : "standard");
if (name != null)
{
return(name.Value);
}
}
return(CldrUtility.GetParentPatterns(locale, s => GetMetaZoneName(s, metaZone, style, isDaylightSaving)));
}
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 static string Resolve(string locale, string ianaTimeZone, DateTime date, TimeZoneNameStyle style)
{
if (ianaTimeZone == "UTC" || ianaTimeZone == "Etc/UTC")
{
return(GetMetaZoneName(locale, "Etc/UTC", style, false));
}
TimeZoneInfo info = TimeZoneConverter.TZConvert.GetTimeZoneInfo(ianaTimeZone);
XElement metaZone = metaZones.XPathSelectElement(String.Format("/supplementalData/metaZones/metazoneInfo/timezone[@type = '{0}']", ianaTimeZone));
if (metaZone != null)
{
IEnumerable <XElement> child = metaZone.Elements("usesMetazone");
XElement usesMetazone = child.First(v => (v.Attribute("from") == null || date >= DateTime.Parse(v.Attribute("from").Value)) && (v.Attribute("to") == null || date < DateTime.Parse(v.Attribute("to").Value)));
return(GetMetaZoneName(locale, usesMetazone.Attribute("mzone").Value, style, info.IsDaylightSavingTime(date)));
}
string hourFormat = GetHourFormat(locale);
string format = hourFormat.Split(';')[info.BaseUtcOffset >= TimeSpan.Zero ? 0 : 1];
return(Regex.Replace(format, "H+|m+", m => {
if (m.Value[0] == 'm')
{
return info.BaseUtcOffset.Minutes.ToString("00", CultureInfo.InvariantCulture);
}
return info.BaseUtcOffset.Hours.ToString(m.Length == 2 ? "00" : "0", CultureInfo.InvariantCulture);
}));
}
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;
}