public static bool TryParse(string value, DateTimeZone timeZone, out ZonedDateTime instant)
{
if (DateTimeOffset.TryParseExact(value, "yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFFK"
, CultureInfo.InvariantCulture, DateTimeStyles.None, out var offset) &&
!DateTime.TryParseExact(value, "yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFF"
, CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out var buffer))
{
instant = new ZonedDateTime(offset.UtcDateTime, timeZone);
return(true);
}
else if (DateTime.TryParse(value, CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out var date))
{
if (timeZone == DateTimeZone.Utc)
{
instant = new ZonedDateTime(DateTime.SpecifyKind(date, DateTimeKind.Utc), timeZone);
}
else
{
date = DateTime.SpecifyKind(date, DateTimeKind.Unspecified);
date = DateTime.SpecifyKind(DateTimeZone.ConvertTime(date, timeZone, DateTimeZone.Utc), DateTimeKind.Utc);
instant = new ZonedDateTime(date, timeZone);
}
return(true);
}
instant = new ZonedDateTime();
return(false);
}
public void TimeZoneTests()
{
var zonesToIgnore = new HashSet <string>();
foreach (var zone in TimeZoneInfo.GetSystemTimeZones().Where(t => !zonesToIgnore.Contains(t.Id)))
{
for (var i = 0; i < 4; i++)
{
var summer = new DateTime(2017 + i, 7, 1, 12, 0, 0, DateTimeKind.Unspecified);
var winter = new DateTime(2017 + i, 1, 1, 12, 0, 0, DateTimeKind.Unspecified);
var custZone = DateTimeZone.ById(zone.Id);
Assert.AreEqual(TimeZoneInfo.ConvertTime(summer, TimeZoneInfo.Utc, zone)
, DateTimeZone.ConvertTime(summer, DateTimeZone.Utc, custZone));
Assert.AreEqual(TimeZoneInfo.ConvertTime(summer, zone, TimeZoneInfo.Utc)
, DateTimeZone.ConvertTime(summer, custZone, DateTimeZone.Utc));
Assert.AreEqual(TimeZoneInfo.ConvertTime(winter, TimeZoneInfo.Utc, zone)
, DateTimeZone.ConvertTime(winter, DateTimeZone.Utc, custZone));
Assert.AreEqual(TimeZoneInfo.ConvertTime(winter, zone, TimeZoneInfo.Utc)
, DateTimeZone.ConvertTime(winter, custZone, DateTimeZone.Utc));
Assert.AreEqual(zone.GetUtcOffset(summer), custZone.GetUtcOffset(summer));
Assert.AreEqual(zone.GetUtcOffset(winter), custZone.GetUtcOffset(winter));
Assert.AreEqual(TimeZoneInfo.ConvertTime(new DateTimeOffset(summer, TimeSpan.FromHours(3)), zone)
, DateTimeZone.ConvertTime(new DateTimeOffset(summer, TimeSpan.FromHours(3)), custZone));
Assert.AreEqual(TimeZoneInfo.ConvertTime(new DateTimeOffset(winter, TimeSpan.FromHours(3)), zone)
, DateTimeZone.ConvertTime(new DateTimeOffset(winter, TimeSpan.FromHours(3)), custZone));
Assert.AreEqual(TimeZoneInfo.ConvertTime(new DateTimeOffset(summer, TimeSpan.FromHours(-7.5)), zone)
, DateTimeZone.ConvertTime(new DateTimeOffset(summer, TimeSpan.FromHours(-7.5)), custZone));
Assert.AreEqual(TimeZoneInfo.ConvertTime(new DateTimeOffset(winter, TimeSpan.FromHours(-7.5)), zone)
, DateTimeZone.ConvertTime(new DateTimeOffset(winter, TimeSpan.FromHours(-7.5)), custZone));
}
}
}
private DateTime ZoneToUtc(DateTime value)
{
if (Zone == DateTimeZone.Utc)
{
return(DateTime.SpecifyKind(value, DateTimeKind.Utc));
}
value = DateTime.SpecifyKind(value, DateTimeKind.Unspecified);
return(DateTime.SpecifyKind(DateTimeZone.ConvertTime(value, Zone, DateTimeZone.Utc), DateTimeKind.Utc));
}
public ZonedDateTime(DateTime value, DateTimeZone timeZone)
{
if (value.Kind == DateTimeKind.Utc)
{
UtcDateTime = DateTime.SpecifyKind(value, DateTimeKind.Utc);
}
else
{
UtcDateTime = DateTime.SpecifyKind(DateTimeZone.ConvertTime(value, DateTimeZone.Local, DateTimeZone.Utc), DateTimeKind.Utc);
}
Zone = timeZone;
}
private string Render(DateTime value)
{
var converted = value;
if (value.Kind == DateTimeKind.Utc)
{
if (_timeZone != DateTimeZone.Utc)
{
converted = DateTimeZone.ConvertTime(value, DateTimeZone.Utc, _timeZone);
}
}
else if (_timeZone != DateTimeZone.Local) // Assume local
{
converted = DateTimeZone.ConvertTime(value, DateTimeZone.Local, _timeZone);
}
return(converted.ToString("s"));
}
public static bool TryParseExact(string value, string format, IFormatProvider provider, DateTimeStyles styles, DateTimeZone timeZone, out ZonedDateTime instant)
{
if ((format.IndexOf('K') >= 0 || format.IndexOf('K') >= 0) &&
DateTimeOffset.TryParseExact(value, format, provider, styles, out var offset))
{
instant = new ZonedDateTime(offset.UtcDateTime, timeZone);
return(true);
}
else if (DateTime.TryParseExact(value, format, provider, styles, out var date))
{
date = DateTime.SpecifyKind(date, DateTimeKind.Unspecified);
date = DateTime.SpecifyKind(DateTimeZone.ConvertTime(date, timeZone, DateTimeZone.Utc), DateTimeKind.Utc);
instant = new ZonedDateTime(date, timeZone);
return(true);
}
instant = new ZonedDateTime();
return(false);
}
public int CompareTo(object obj)
{
if (obj is ZonedDateTime zonded)
{
return(CompareTo(zonded));
}
if (obj is DateTimeOffset offset)
{
return(UtcDateTime.CompareTo(offset.UtcDateTime));
}
if (!(obj is DateTime date))
{
throw new NotSupportedException();
}
if (date.Kind == DateTimeKind.Utc)
{
return(UtcDateTime.CompareTo(date));
}
return(UtcDateTime.CompareTo(DateTimeZone.ConvertTime(date, DateTimeZone.Local, DateTimeZone.Utc)));
}
