Page OutputCache wrong expire date format

[thienvc]

Dnn.Platform/DNN Platform/Library/Services/OutputCache/Providers/FileProvider.cs

Lines 172 to 176 in 2784c12

	using (var oWrite = File.CreateText(attribFile))
	{
	oWrite.WriteLine(DateTime.UtcNow.Add(duration).ToString());
	oWrite.Close();
	}

Needs to be modified to: DateTime.UtcNow.Add(duration).ToString(CultureInfo.InvariantCulture)

[thienvc]

@bdukes
To fix this problem actually have to fix it here too:

Dnn.Platform/DNN Platform/Library/Services/OutputCache/Providers/FileResponseFilter.cs

Line 105 in 2784c12

oWrite.WriteLine(this._cacheExpiration.ToString());