/// <summary>
/// Returns the sunrise or sunset datetime for given latitude and longitude coordates
/// </summary>
/// <param name="getSunrise"></param>
/// <param name="LatLng"></param>
/// <returns></returns>
private DateTime?GetSunriseSunset(bool getSunrise, string LatLng)
{
USNavySunData sunriseSunsetData = GetSunriseSunsetDataFromNavy(LatLng);
// Get today's sunrise and sunset from USNavySunData object
if (sunriseSunsetData != null)
{
DateTime?sunrise = null, sunset = null;
//var timeZone = GetTimeZoneInfo(LatLng);
var tz = GetTimeZoneData(LatLng);
foreach (var item in sunriseSunsetData.sundata)
{
if (item.phen == "R")
{
sunrise = DateTime.Parse(item.time).AddSeconds(tz.rawOffset + tz.dstOffset);
}
if (item.phen == "S")
{
sunset = DateTime.Parse(item.time).AddSeconds(tz.rawOffset + tz.dstOffset);
}
}
if (sunrise != null && sunset != null)
{
/* Due to summer tiems and UTC offset, the sunset was coming out after midnight UTC, but was being set to the same date
* so sunset was showing as before sunrise. Adding a day to account for this anomoly
*/
if (sunrise > sunset)
{
sunset = sunset.Value.AddDays(1);
}
if (getSunrise)
{
return(sunrise);
}
return(sunset);
}
}
return(null);
}
/// <summary>
/// Get the Sun data JSON object from the US Navy web service
/// </summary>
/// <param name="Address"></param>
/// <returns></returns>
private USNavySunData GetSunriseSunsetDataFromNavy(string latLng)
{
// Get the Sunrise/Sunset data from the US Navy web service api
string cacheKey = FormatCacheKey("USNavySunriseSunset", latLng);
USNavySunData sunriseSunsetData = Cache.Get <USNavySunData>(cacheKey);
if (sunriseSunsetData == null)
{
var url = string.Format("http://api.usno.navy.mil/rstt/oneday?date={0}&coords={1}", DateTime.Now.ToString("MM/dd/yyyy"), latLng);
sunriseSunsetData = GetAsyncResult <USNavySunData>(url);
if (sunriseSunsetData != null)
{
Cache.Set(cacheKey, sunriseSunsetData, 43200);
}
}
return(sunriseSunsetData);
}
