public static TimeZoneInfo ParseTimeZoneId(string id)
{
// See if explicit timezone offset
if (id[0] == '-' || id[0] == '+')
{
TimeZoneTag tzt;
if (TimeZoneTag.TryParse(id, out tzt))
{
string idstr = $"(UTC{id})";
string name = $"{idstr} Custom";
return(TimeZoneInfo.CreateCustomTimeZone(idstr, tzt.UtcOffset, name, name));
}
}
// Check the abbreviations
foreach (var pair in s_tzAbbreviations)
{
if (string.Equals(id, pair.Key, StringComparison.OrdinalIgnoreCase))
{
try
{
var tz = TimeZoneInfo.FindSystemTimeZoneById(pair.Value);
if (tz != null)
{
return(tz);
}
}
catch
{
// Do nothing. FindTimeZoneById throws an exception if the value is not found (bad design).
// In that case we just skip the abbreviation.
}
break;
}
}
// Look it up directly
try
{
var tz = TimeZoneInfo.FindSystemTimeZoneById(id);
if (tz != null)
{
return(tz);
}
}
catch
{
// Do nothing. FindTimeZoneById throws an exception if the value is not found.
}
return(null);
}
protected virtual void LoadMetadata()
{
if (m_uri == null)
{
return;
}
try
{
using (var ps = WinShell.PropertyStore.Open(m_uri.LocalPath, false))
{
// See if timezone and precision info are included
int precision = 0;
TimeZoneTag tz = null;
foreach (var pair in MetaTag.Extract(ps.GetValue(s_pkComment) as string))
{
if (pair.Key.Equals("datePrecision", StringComparison.OrdinalIgnoreCase))
{
if (!int.TryParse(pair.Value, out precision))
{
precision = 0;
}
}
if (pair.Key.Equals("timezone", StringComparison.OrdinalIgnoreCase))
{
if (!TimeZoneTag.TryParse(pair.Value, out tz))
{
tz = null;
}
}
}
// Get the date the photo or video was taken.
{
object date = ps.GetValue(s_pkDateTaken);
if (date == null)
{
date = ps.GetValue(s_pkDateEncoded);
}
if (date != null && date is DateTime)
{
var dt = new DateTag((DateTime)date, tz, precision);
dt = dt.ResolveTimeZone(TimeZoneInfo.Local);
var ci = CultureInfo.CurrentCulture;
// Use my preferred format if US English
string format = ci.Name.Equals(c_usCultureName, StringComparison.Ordinal)
? c_usOverrideDateFormat
: ci.DateTimeFormat.FullDateTimePattern;
m_dateTaken = dt.ToString(format, ci);
}
}
var tags = new List <string>();
// Get title
string title = ps.GetValue(s_pkTitle) as string;
if (!string.IsNullOrEmpty(title))
{
tags.Add(title);
}
// Get keywords
var keywords = ps.GetValue(s_pkKeywords) as IEnumerable <string>;
if (keywords != null)
{
tags.AddRange(keywords);
}
if (tags.Count > 0)
{
Tags = tags;
}
}
}
catch (Exception err)
{
Debug.WriteLine(err.ToString());
}
}
