Looks like the Great Firewall or something like it is preventing you from completely loading www.skritter.com because it is hosted on Google App Engine, which is periodically blocked. Try instead our mirror:
This might also be caused by an internet filter, such as SafeEyes. If you have such a filter installed, try adding appspot.com to the list of allowed domains.
If your client needs to determine the current Skritter-date in order to perform reviews, you should use this endpoint to check your calculations are correct, and that the client has correct time settings. If time settings are not correct, you should inform the user of the discrepancy, and use the values from the server as much as possible rather than the values from the client.