java: timestamp -> datetime

java_datastamp2date/datetime.java

@@ -0,0 +1,108 @@
+package datetime;
+
+class DaysOfYear {
+	int year;
+	int days;
+	
+	public DaysOfYear(int year, int days) {
+		this.year = year;
+		this.days = days;
+	}
+}
+
+class DaysOf4Year {
+	int firstYear;
+	DaysOfYear[] doy;
+	
+	void setYearAfter2000(boolean after2k) {
+		this.doy = new DaysOfYear[4];
+		this.doy[0] = new DaysOfYear(4, 1461);
+		this.doy[1] = new DaysOfYear(3, 1096);
+		if (after2k) {
+			this.firstYear = 2000;
+			this.doy[1] = new DaysOfYear(2, 731);
+			this.doy[1] = new DaysOfYear(1, 366);
+		} else {
+			this.firstYear = 1970;
+			this.doy[1] = new DaysOfYear(2, 730);
+			this.doy[1] = new DaysOfYear(1, 365);
+		}
+	}
+}
+
+class Datetime {
+	int year;
+	int month;
+	int date;
+	int hour;
+	int minute;
+	int second;
+	
+	private long setYear(long day) {
+		int[] daysOfYear = { 0, 365, 730, 1096 };
+		
+		if (day >= 10957) {
+			day -= 10957;
+			this.year = 2000;
+			daysOfYear[1] += 1;
+			daysOfYear[2] += 1;
+		} else {
+			this.year = 1970;
+		}
+		
+		while (day >= 1461) {
+			this.year += 4;
+			day -= 1461;
+		}
+
+		for (int i = 3; i > 0; i--) {
+			if (day >= daysOfYear[i]) {
+				this.year += i;
+				day -= daysOfYear[i];
+				break;
+			}
+		}
+
+		return day;
+	}
+	
+	private void setMonthDate(int day) {
+		int[] daysBeforeMonth = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
+		if ((this.year % 400 == 0) || ((this.year % 100 != 0) && (this.year % 4 == 0))) {
+			for (int i = 2; i < 12; i++) {
+				daysBeforeMonth[i] += 1;
+			}
+		}
+		for (int i = 11; i >= 0; i--) {
+			if (daysBeforeMonth[i] < day) {
+				this.month = i + 1;
+				this.date = day - daysBeforeMonth[i] + 1;
+				return;
+			}
+		}
+	}
+	
+	private void setSecond(long second) {
+		this.hour = (int)(second / 3600);
+		second %= 3600;
+		this.minute = (int)(second / 60);
+		second %= 60;
+		this.second = (int)second;
+	}
+	
+	void loadStamp(long stamp)	{
+		this.year = 0;
+		this.month = 0;
+		this.date = 0;
+		this.hour = 0;
+		this.minute = 0;
+		this.second = 0;
+		this.setMonthDate((int)this.setYear(stamp / 86400));
+		this.setSecond(stamp % 86400);
+	}
+	
+	String get() {
+		return String.format("%d-%d-%d %d:%02d:%02d",
+				this.year, this.month, this.date, this.hour, this.minute, this.second);
+	}
+}

java_datastamp2date/run.java

@@ -0,0 +1,13 @@
+package datetime;
+
+public class run {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		Datetime curTime = new Datetime();
+		curTime.loadStamp(1550684282);
+		System.out.println(curTime.get());
+	}
+
+}