public virtual DateTime? GetDate(int tagType, [CanBeNull] TimeZoneInfo timeZone)
{
object o = GetObject(tagType);
if (o == null)
{
return null;
}
if (o is DateTime)
{
return (DateTime)o;
}
if (o is string)
{
// This seems to cover all known Exif date strings
// Note that " : : : : " is a valid date string according to the Exif spec (which means 'unknown date'): http://www.awaresystems.be/imaging/tiff/tifftags/privateifd/exif/datetimeoriginal.html
string[] datePatterns = new string[] { "yyyy:MM:dd HH:mm:ss", "yyyy:MM:dd HH:mm", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm" };
string dateString = (string)o;
foreach (string datePattern in datePatterns)
{
try
{
DateFormat parser = new SimpleDateFormat(datePattern);
if (timeZone != null)
{
parser.SetTimeZone(timeZone);
}
return parser.Parse(dateString);
}
catch (ParseException)
{
}
}
}
// simply try the next pattern
return null;
}
