ExpiresHeaderValue.cs

using System;

namespace Cuemon.AspNetCore.Http.Headers
{
    /// <summary>
    /// Represents a HTTP Expires header that contains the date/time after which the response is considered stale.
    /// </summary>
    public class ExpiresHeaderValue
    {
        private readonly DateTime _expires;

        /// <summary>
        /// Initializes a new instance of the <see cref="ExpiresHeaderValue"/> class.
        /// </summary>
        /// <param name="expires">The <see cref="TimeSpan"/> value for when the client-cache expires.</param>
        public ExpiresHeaderValue(TimeSpan expires)
        {
            _expires = DateTime.UtcNow.Add(expires);
        }

        /// <summary>
        /// Returns a <see cref="string" /> that represents this instance.
        /// </summary>
        /// <returns>A <see cref="string" /> that represents this instance.</returns>
        public override string ToString()
        {
            return _expires.ToString("R");
        }
    }
}