/// <summary>
/// 地球時間をエオルゼア時間に変換する
/// </summary>
/// <param name="localTime">
/// 地球の現地時間</param>
/// <returns>
/// エオルゼア時間</returns>
public static EorzeaTime ToEorzeaTime(
DateTimeOffset localTime)
{
// UTCにおける差分を算出する
var diff = localTime.ToUniversalTime() - EorzeaTimeOriginByUTC;
var totalSec = diff.TotalSeconds;
var delta = totalSec * LTETRatio;
var secound = (int)Math.Truncate(delta % 60d);
delta -= secound;
delta /= 60.0d;
var minute = (int)Math.Truncate(delta % 60d);
delta -= minute;
delta /= 60.0d;
var hour = (int)Math.Truncate(delta % 24d);
delta -= hour;
delta /= 24.0d;
var day = (int)Math.Truncate(delta % 32d);
delta -= day;
delta /= 32.0d;
var month = (int)Math.Truncate(delta % 12d);
delta -= month;
delta /= 12.0d;
var year = (int)Math.Truncate(delta);
// 年月日は1オリジンなので1を加える
var et = new EorzeaTime();
et.Year = (1 + year) % 10000;
et.Month = 1 + month;
et.Day = 1 + day;
et.Hour = hour;
et.Minute = minute;
et.Second = 0;
return(et);
}
public static DateTimeOffset FromEorzeaTime(
EorzeaTime eorzeaTime)
{
var delta = 0d;
delta += (eorzeaTime.Year - 1) * 12 * 32 * 24 * 60 * 60;
delta += (eorzeaTime.Month - 1) * 32 * 24 * 60 * 60;
delta += (eorzeaTime.Day - 1) * 24 * 60 * 60;
delta += eorzeaTime.Hour * 60 * 60;
delta += eorzeaTime.Minute * 60;
delta += eorzeaTime.Second;
var totalSec = delta / LTETRatio;
var utc = EorzeaTimeOriginByUTC.AddSeconds(totalSec);
return(utc.ToLocalTime());
}