public static TimeZoneViewModel[] GetSystemTimeZones() {
var tz_list = new List<TimeZoneViewModel>(256);
var sys_tzs = TimeZoneInfo.GetSystemTimeZones();
var now = DateTime.Now;
foreach (var tzi in sys_tzs) {
PosixTz.Dst dst = null;
var rule = GetSystemTimeZoneRule(now, tzi);
var std_offset = -tzi.BaseUtcOffset.TotalSeconds.ToInt32();
if (rule != null) {
var start = PosixTzExtensions.GetPosixRuleFromTransitionTime(
rule.DaylightTransitionStart
);
var end = PosixTzExtensions.GetPosixRuleFromTransitionTime(
rule.DaylightTransitionEnd
);
var dst_offset = std_offset - rule.DaylightDelta.TotalSeconds.ToInt32();
dst = new PosixTz.Dst(
/*PosixTzWriter.NormalizeName(tzi.DaylightName)*/"DaylightTime", dst_offset, start, end
);
}
var posixTz = new PosixTz(
PosixTzWriter.NormalizeName(/*tzi.StandardName*/tzi.Id), std_offset, dst
);
tz_list.Add(new TimeZoneViewModel(
tzi.DisplayName, null, posixTz
));
}
return tz_list.OrderBy(x =>
new Tuple<int, string>(-x.posixTz.offset, x.displayName)
).ToArray();
}
//std offset [dst[offset],start[/time],end[/time]]
public PosixTz ReadExpandedTimeZone()
{
SkipWhiteSpaces();
string std_name = null;
if (!ReadName(ref std_name) || std_name.Length < 3)
{
//std is required and should be no less than three characters
RaiseParseError();
}
SkipWhiteSpaces();
int std_ofs = 0;
if (!ReadTimeOffset(ref std_ofs))
{
//The offset following std shall be required.
RaiseParseError();
}
SkipWhiteSpaces();
if (AtEnd())
{
//if dst is missing, then the alternative time does not apply in this locale.
return(new PosixTz(std_name, std_ofs, null));
}
//parse dst clause
string dst_name = null;
if (!ReadName(ref dst_name))
{
//dst clause should begin with dst name which should be no less than three characters
RaiseParseError();
}
SkipWhiteSpaces();
int dst_offset = 0;
if (!ReadTimeOffset(ref dst_offset))
{
//if no offset follows dst, the alternative time is assumed to be one hour ahead
//of standard time.
dst_offset = PosixTz.GetDefaultDstOffset(std_ofs);
}
SkipWhiteSpaces();
if (!ReadSpecChar(',', ';'))
{
//no rules is specified
RaiseParseError();
}
SkipWhiteSpaces();
PosixTz.DstRule start = null;
if (!ReadRule(ref start))
{
//start rule is not specified
RaiseParseError();
}
SkipWhiteSpaces();
if (!ReadSpecChar(',', ';'))
{
//end rule is not specified
RaiseParseError();
}
SkipWhiteSpaces();
PosixTz.DstRule end = null;
if (!ReadRule(ref end))
{
//end rule is not specified
RaiseParseError();
}
var dst = new PosixTz.Dst(dst_name, dst_offset, start, end);
SkipWhiteSpaces();
if (!AtEnd())
{
//unexpected
RaiseParseError();
}
return(new PosixTz(std_name, std_ofs, dst));
}
//std offset [dst[offset],start[/time],end[/time]]
public PosixTz ReadExpandedTimeZone() {
SkipWhiteSpaces();
string std_name = null;
if (!ReadName(ref std_name) || std_name.Length < 3) {
//std is required and should be no less than three characters
RaiseParseError();
}
SkipWhiteSpaces();
int std_ofs = 0;
if (!ReadTimeOffset(ref std_ofs)) {
//The offset following std shall be required.
RaiseParseError();
}
SkipWhiteSpaces();
if (AtEnd()) {
//if dst is missing, then the alternative time does not apply in this locale.
return new PosixTz(std_name, std_ofs, null);
}
//parse dst clause
string dst_name = null;
if (!ReadName(ref dst_name)) {
//dst clause should begin with dst name which should be no less than three characters
RaiseParseError();
}
SkipWhiteSpaces();
int dst_offset = 0;
if (!ReadTimeOffset(ref dst_offset)) {
//if no offset follows dst, the alternative time is assumed to be one hour ahead
//of standard time.
dst_offset = PosixTz.GetDefaultDstOffset(std_ofs);
}
SkipWhiteSpaces();
if (!ReadSpecChar(',', ';')) {
//no rules is specified
RaiseParseError();
}
SkipWhiteSpaces();
PosixTz.DstRule start = null;
if (!ReadRule(ref start)) {
//start rule is not specified
RaiseParseError();
}
SkipWhiteSpaces();
if (!ReadSpecChar(',', ';')) {
//end rule is not specified
RaiseParseError();
}
SkipWhiteSpaces();
PosixTz.DstRule end = null;
if (!ReadRule(ref end)) {
//end rule is not specified
RaiseParseError();
}
var dst = new PosixTz.Dst(dst_name, dst_offset, start, end);
SkipWhiteSpaces();
if (!AtEnd()) {
//unexpected
RaiseParseError();
}
return new PosixTz(std_name, std_ofs, dst);
}
