// 将Java中的日期转换为Delphi中的日期
TDateTime ConvertJavaDateTimeToDelphiDateTime(__int64 Value)
{
    return IncMilliSecond(StrToDate("1970-1-1"), Value);
}

// 将Delphi中的日期转换为Java中的日期
double ConvertDelphiDateTimeToJavaDateTime(TDateTime ADateTime)
{
    return MilliSecondSpan(ADateTime, StrToDate("1970-1-1"));
}

    // pc端接收到的数据00 00 01 59 80 f9 e0 7a
    // 2017-01-09 02:06:16
    byte bta[8] = { 0x7a,0xe0,0xf9,0x80,0x59,0x01,0x00,0x00    };
    // byte bta[8] = {  0x00,0x00,0x01,0x59,0x80,0xf9,0xe0,0x7a    };
    double da = *(__int64*)&bta[0];
    TDateTime dtad;
    dtad = ConvertJavaDateTimeToDelphiDateTime(da);

    TDateTime dt1;
    dt1 = StrToDateTime("2017-01-09 02:06:16");
    double jv1;
    jv1 = ConvertDelphiDateTimeToJavaDateTime(dt1);
    byte bt1[8];
    memcpy(&bt1[0], (byte*)&jv1, 8);

    //check

    TDateTime dtad1;
     dtad1  = ConvertJavaDateTimeToDelphiDateTime(jv1);

var
  aint: int64;
  bs: array [0 .. 7] of byte;
  pb: PByteArray;
begin
  aint := 1484072004920;
  pb := @aint;
  Move(aint, bs[0], 8);