impl timezone

src/DataType/XTimeZone.cs

@@ -0,0 +1,182 @@
+namespace eXtensionSharp;
+
+public class XTimeZone
+{
+    private static Lazy<XTimeZone> _instance = new Lazy<XTimeZone>(() => new XTimeZone());
+    public static XTimeZone Instance => _instance.Value;
+
+    private List<TimeZonSet> _timeZonSets;
+
+    public XTimeZone()
+    {
+        _timeZonSets = new List<TimeZonSet>()
+        {
+            new TimeZonSet()
+            {
+                CultureCode = "ko-KR",
+                TimeZones = new List<TimeZone>()
+                {
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 124,
+                        LongitudeTo = 131,                        
+                        LatitudeFrom = 33,
+                        LatitudeTo = 39,
+                        TimeZoneName ="Korea Standard Time"
+                    }
+                }
+            },
+            new TimeZonSet()
+            {
+                CultureCode = "en-US",
+                TimeZones = new List<TimeZone>()
+                {
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 67,
+                        LongitudeTo = 82.5,                        
+                        LatitudeFrom = 24,
+                        LatitudeTo = 50,
+                        TimeZoneName ="Eastern Standard Time" 
+                    },
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 82.5,
+                        LongitudeTo = 97.5,                        
+                        LatitudeFrom = 25,
+                        LatitudeTo = 49,
+
+                        TimeZoneName ="Central Standard Time",
+                    },
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 97.5,
+                        LongitudeTo = 112.5,                        
+                        LatitudeFrom = 31,
+                        LatitudeTo = 49,
+
+                        TimeZoneName ="Mountain Standard Time",
+                    },
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 112.5,
+                        LongitudeTo = 125,                        
+                        LatitudeFrom = 32,
+                        LatitudeTo = 49,
+
+                        TimeZoneName ="Pacific Standard Time",
+                    },
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 125,
+                        LongitudeTo = 172.5,                        
+                        LatitudeFrom = 51,
+                        LatitudeTo = 71,
+
+                        TimeZoneName ="Alaska Standard Time",
+                    },
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 154,
+                        LongitudeTo = 172.5,                        
+                        LatitudeFrom = 18,
+                        LatitudeTo = 30,
+
+                        TimeZoneName ="Hawaii-Aleutian Standard Time",
+                    },
+                    new TimeZone()
+                    {
+                        LongitudeFrom = 60,
+                        LongitudeTo = 67,                        
+                        LatitudeFrom = 18,
+                        LatitudeTo = 47,
+
+                        TimeZoneName ="Atlantic Standard Time",
+                    },                    
+                },
+            }
+        };
+    }
+
+    /// <summary>
+    /// get timezone name by culture code
+    /// ** caution : multi-time zone code returns a "," separator.
+    /// </summary>
+    /// <param name="cultureCode"></param>
+    /// <returns></returns>
+    public string GetTimeZone(string cultureCode)
+    {
+        if (cultureCode.xIsEmpty()) return string.Empty;
+
+        var selected = _timeZonSets.FirstOrDefault(m => m.CultureCode == cultureCode);
+        if (selected.xIsNotEmpty())
+        {
+            if (selected.TimeZones.Count <= 1)
+            {
+                return selected.TimeZones.First().TimeZoneName;
+            }
+            else
+            {
+                return selected.TimeZones.Select(m => m.TimeZoneName).xJoin();
+            }
+        }
+
+        return string.Empty;
+    }
+
+    /// <summary>
+    /// get timezone name by culture code
+    /// </summary>
+    /// <param name="cultureCode"></param>
+    /// <returns></returns>
+    public string[] GetTimeZones(string cultureCode)
+    {
+        if (cultureCode.xIsEmpty()) return Array.Empty<string>();
+
+        var selected = _timeZonSets.FirstOrDefault(m => m.CultureCode == cultureCode);
+        if (selected.xIsNotEmpty())
+        {
+            if (selected.TimeZones.Count <= 1)
+            {
+                return new[] { selected.TimeZones.First().TimeZoneName };
+            }
+            else
+            {
+                return selected.TimeZones.Select(m => m.TimeZoneName).ToArray();
+            }
+        }
+
+        return Array.Empty<string>();
+    }
+
+    /// <summary>
+    /// get timezone name by geo coordinate
+    /// </summary>
+    /// <param name="latitude"></param>
+    /// <param name="longitude"></param>
+    /// <returns></returns>
+    public string GetTimeZone(double latitude, double longitude)
+    {
+        var selected = _timeZonSets.Select(timeZonSet => timeZonSet.TimeZones
+                .FirstOrDefault(m => (m.LatitudeFrom <= latitude && m.LatitudeTo >= latitude) &&
+                                     (m.LongitudeFrom <= longitude && m.LongitudeTo >= longitude)))
+            .FirstOrDefault();
+
+        return selected?.TimeZoneName;
+    }
+}
+
+internal class TimeZonSet
+{
+    public string CultureCode { get; set; }
+    public List<TimeZone> TimeZones { get; set; }
+}
+
+internal class TimeZone
+{
+    public double LatitudeFrom { get; set; }
+    public double LatitudeTo { get; set; }
+    public double LongitudeFrom { get; set; }
+    public double LongitudeTo { get; set; }
+    public string TimeZoneName { get; set; }
+}