using System; using System.Collections.Generic; namespace XCharts.Runtime { public static class DateTimeUtil { //private static readonly DateTime k_DateTime1970 = TimeZoneInfo.ConvertTime(new DateTime(1970, 1, 1), TimeZoneInfo.Local); private static readonly DateTime k_DateTime1970 = new DateTime(1970, 1, 1); public static readonly int ONE_SECOND = 1; public static readonly int ONE_MINUTE = ONE_SECOND * 60; public static readonly int ONE_HOUR = ONE_MINUTE * 60; public static readonly int ONE_DAY = ONE_HOUR * 24; public static readonly int ONE_MONTH = ONE_DAY * 30; public static readonly int ONE_YEAR = ONE_DAY * 365; public static readonly int MIN_TIME_SPLIT_NUMBER = 4; private static string s_YearDateFormatter = "yyyy"; //private static string s_MonthDateFormatter = "MM"; //private static string s_DayDateFormatter = "dd"; private static string s_HourDateFormatter = "HH:mm"; private static string s_MinuteDateFormatter = "HH:mm"; private static string s_SecondDateFormatter = "HH:mm:ss"; //private static string s_DateFormatter = "yyyy-MM-dd HH:mm:ss"; public static int GetTimestamp() { return (int) (DateTime.Now - k_DateTime1970).TotalSeconds; } public static int GetTimestamp(DateTime time) { return (int) (time - k_DateTime1970).TotalSeconds; } public static DateTime GetDateTime(int timestamp) { long span = ((long) timestamp) * 10000000; return k_DateTime1970.Add(new TimeSpan(span)); } internal static string GetDateTimeFormatString(DateTime dateTime, double range) { var dateString = String.Empty; if (range >= DateTimeUtil.ONE_YEAR * DateTimeUtil.MIN_TIME_SPLIT_NUMBER) { dateString = dateTime.ToString(s_YearDateFormatter); } else if (range >= DateTimeUtil.ONE_MONTH * DateTimeUtil.MIN_TIME_SPLIT_NUMBER) { dateString = dateTime.Month == 1 ? dateTime.ToString(s_YearDateFormatter) : XCSettings.lang.GetMonthAbbr(dateTime.Month); } else if (range >= DateTimeUtil.ONE_DAY * DateTimeUtil.MIN_TIME_SPLIT_NUMBER) { dateString = dateTime.Day == 1 ? XCSettings.lang.GetMonthAbbr(dateTime.Month) : XCSettings.lang.GetDay(dateTime.Day); } else if (range >= DateTimeUtil.ONE_HOUR * DateTimeUtil.MIN_TIME_SPLIT_NUMBER) { dateString = dateTime.ToString(s_HourDateFormatter); } else if (range >= DateTimeUtil.ONE_MINUTE * DateTimeUtil.MIN_TIME_SPLIT_NUMBER) { dateString = dateTime.ToString(s_MinuteDateFormatter); } else { dateString = dateTime.ToString(s_SecondDateFormatter); } return dateString; } /// /// 根据给定的最大最小时间戳范围,计算合适的Tick值 /// /// /// /// /// internal static void UpdateTimeAxisDateTimeList(List list, int minTimestamp, int maxTimestamp, int splitNumber) { list.Clear(); var range = maxTimestamp - minTimestamp; if (range <= 0) return; if (splitNumber <= 0) splitNumber = 1; var dtMin = DateTimeUtil.GetDateTime(minTimestamp); var dtMax = DateTimeUtil.GetDateTime(maxTimestamp); if (range >= ONE_YEAR * MIN_TIME_SPLIT_NUMBER) { var num = Math.Max(range / (splitNumber * ONE_YEAR), 1); var dtStart = new DateTime(dtMin.Year + 1, 1, 1); while (dtStart.Ticks < dtMax.Ticks) { list.Add(DateTimeUtil.GetTimestamp(dtStart)); dtStart = dtStart.AddYears(num); } } else if (range >= ONE_MONTH * MIN_TIME_SPLIT_NUMBER) { var num = Math.Max(range / (splitNumber * ONE_MONTH), 1); var dtStart = new DateTime(dtMin.Year, dtMin.Month, 1).AddMonths(1); while (dtStart.Ticks < dtMax.Ticks) { list.Add(DateTimeUtil.GetTimestamp(dtStart)); dtStart = dtStart.AddMonths(num); } } else if (range >= ONE_DAY * MIN_TIME_SPLIT_NUMBER) { var tick = GetTickSecond(range, splitNumber, ONE_DAY); var startTimestamp = (minTimestamp - minTimestamp % tick) + tick; AddTickTimestamp(list, startTimestamp, maxTimestamp, tick); } else if (range >= ONE_HOUR * MIN_TIME_SPLIT_NUMBER) { var tick = GetTickSecond(range, splitNumber, ONE_HOUR); var startTimestamp = (minTimestamp - minTimestamp % tick) + tick; AddTickTimestamp(list, startTimestamp, maxTimestamp, tick); } else if (range >= ONE_MINUTE * MIN_TIME_SPLIT_NUMBER) { var tick = GetTickSecond(range, splitNumber, ONE_MINUTE); var startTimestamp = (minTimestamp - minTimestamp % tick) + tick; AddTickTimestamp(list, startTimestamp, maxTimestamp, tick); } else { var tick = GetTickSecond(range, splitNumber, ONE_SECOND); var startTimestamp = (minTimestamp - minTimestamp % tick) + tick; AddTickTimestamp(list, startTimestamp, maxTimestamp, tick); } } private static int GetTickSecond(int range, int splitNumber, int tickSecond) { var num = 0; if (splitNumber > 0) { num = Math.Max(range / (splitNumber * tickSecond), 1); } else { num = 1; var tick = tickSecond; while (range / tick > 8) { num++; tick = num * tickSecond; } } return num * tickSecond; } private static void AddTickTimestamp(List list, int startTimestamp, int maxTimestamp, int tickSecond) { while (startTimestamp < maxTimestamp) { list.Add(startTimestamp); startTimestamp += tickSecond; } } } }