Sitemap LastMod property serialized in an incorrect format

Google’s webmasters tools is throwing several errors on the LastMod property, “An invalid date was found. Please fix the date or formatting before resubmitting”. Upon inspection, as per sitemaps.org, the date must be in a W3C format.

I believe a minor update in SitemapNode.cs such as the following should do the trick (PS: not tested):

        /// <summary>
        /// Shows the date the URL was last modified, value is optional.
        /// </summary>
        [XmlElement("lastmod", Order = 2)]
        public string LastModificationDateW3C
        {
            get
            {
                if (this.LastModificationDate != null)
                {
                    return XmlConvert.ToString((DateTime)this.LastModificationDate);
                }
                return null;
            }
        }

        /// <summary>
        /// The date the URL was last modified
        /// </summary>
        public DateTime? LastModificationDate { get; set; }

[geogauci]

The first method (converting to UTC) does not work, however the second method works perfectly! 😃

Just a recap, after retrieving the datetime required, I created a new DateTime, as per your second suggestion, like so:

        DateTime lta = <get some date, _in local time zone_ >
        DateTime w3cDateTime = new DateTime(lta.Year, lta.Month, lta.Day, lta.Hour, lta.Minute, lta.Second, DateTimeKind.Local);
        sitemapNode.LastModificationDate = w3cDateTime;

Thanks for your support and for your awesome tool! 😃

[uhaciogullari]

You’re welcome.

It seems like there is a ToLocalTime method as well and it looks cleaner.