Pack/Unpacks date stored in kdb format : Date Format « Data Type « Java

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Java » Data Type » Date FormatScreenshots 
Pack/Unpacks date stored in kdb format
      
import java.util.Calendar;
import java.util.Date;

public class Util{

  /**
   * Unpacks date stored in kdb format.
   
   @param d
   @return
   */
  public static Date unpackDate(byte[] d) {
    // Byte bits: 00000000 11111111 22222222 33333333 44444444
    // Contents : 00YYYYYY YYYYYYMM MMDDDDDH HHHHMMMM MMSSSSSS
    int year = (d[0<< 6((d[1>> 20x0000003F);
    int month = ((d[10x00000003<< 2((d[2>> 60x00000003);
    int day = (d[2>> 10x0000001F;
    int hour = ((d[20x00000001<< 4((d[3>> 40x0000000F);
    int minute = ((d[30x0000000F<< 2((d[4>> 60x00000003);
    int second = d[40x0000003F;
    Calendar calendar = Calendar.getInstance();
    calendar.set(year, month-1, day, hour, minute, second);
    calendar.set(Calendar.MILLISECOND, 0);
    return calendar.getTime();
  }

  public static byte[] packDate(Date date) {
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    // Byte bits: 00000000 11111111 22222222 33333333 44444444
    // Contents : 00YYYYYY YYYYYYMM MMDDDDDH HHHHMMMM MMSSSSSS
    byte[] bytes = new byte[5];
    int s = c.get(Calendar.SECOND);
    int m = c.get(Calendar.MINUTE);
    int h = c.get(Calendar.HOUR_OF_DAY);
    int d = c.get(Calendar.DATE);
    int mm = c.get(Calendar.MONTH1;
    int y = c.get(Calendar.YEAR);

    bytes[4(byte) ((m << 6| s)
    bytes[3(byte) ((m >> )(h<<4));
    bytes[2(byte) ((h>>4(d<<1(mm <<6));
    bytes[1(byte) ((mm>>2(y<<2));
    bytes[0(byte) (y>>6);
    
    return bytes;
  }
}

   
    
    
    
    
    
  
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