Yes, time actually flies in a Raspberry Pi. It appears that it can not remember the current time when it is powered off in Windows 10 IoT Core.
One solution is to make use of a ‘sensor’ which tells the time.
Another solution is to ask ‘the internet’ for the current time. I use this service although there will be more, I can imagine 🙂
using System;
using System.Globalization;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.Web.Http;
using Windows.Web.Http.Headers;
...
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.UserAgent.Add(
new HttpProductInfoHeaderValue(
"Mozilla / 5.0(Windows NT 10.0; Win64; x64)"));
var response = await client.SendRequestAsync(
new HttpRequestMessage(
HttpMethod.Get,
new Uri("http://www.timeapi.org/utc/now.json")));
if (response.StatusCode == HttpStatusCode.Ok)
{
// {{"dateString": "2015-09-21T21:46:34+02:00"}}
dynamic json = JsonConvert.DeserializeObject(
response.Content.ToString());
DateTime dateTime =
DateTime.Parse(json.dateString.ToString(),
CultureInfo.InvariantCulture);
tbTest.Text = "Universal time: "
+ dateTime.ToUniversalTime();
}
else
{
tbTest.Text = response.StatusCode.ToString();
}
}
This service can return a date time in several ways, but I prefer the UTC. So when received, the datetime json message is transformed into a datetime which will give me the UTC.
Sander van de Velde 