/// <summary>
/// Makes sure the datetime is formatted according to the iptc specification.
/// <example>
/// A date will be formatted as CCYYMMDD, e.g. "19890317" for 17 March 1989.
/// A time value will be formatted as HHMMSS±HHMM, e.g. "090000+0200" for 9 o'clock Berlin time,
/// two hours ahead of UTC.
/// </example>
/// </summary>
/// <param name="tag">The tag of the iptc value.</param>
/// <param name="dateTimeOffset">The datetime.</param>
public void SetValue(IptcTag tag, DateTimeOffset dateTimeOffset)
{
var isDate = IptcTagHelper.IsDate(tag);
if (!isDate && !IptcTagHelper.IsTime(tag))
{
throw new ArgumentException("iptc tag is not a time or date type", nameof(tag));
}
var formattedDate = isDate
? dateTimeOffset.ToString("yyyyMMdd", CultureInfo.InvariantCulture)
: dateTimeOffset.ToString("HHmmsszzzz", CultureInfo.InvariantCulture).Replace(":", string.Empty);
SetValue(tag, formattedDate);
}
/// <summary>
/// Sets the value of the specified tag.
/// </summary>
/// <param name="tag">The tag of the iptc value.</param>
/// <param name="value">The value.</param>
public void SetValue(IptcTag tag, string value)
{
Initialize();
if (!IptcTagHelper.IsRepeatable(tag))
{
foreach (var iptcValue in _values)
{
if (iptcValue.Tag == tag)
{
iptcValue.Value = value;
return;
}
}
}
_values.Add(new IptcValue(tag, value));
}
