JAVA instance method to obtain current system events

System.currentTimeMillis() generates a current millisecond, which is actually the number of milliseconds since 0:00 on January 1, 1970. Date() is actually equivalent to Date(System.currentTimeMillis()), because Date The class also has a constructor Date(longdate), which is used to calculate the millisecond difference between long seconds and January 1, 1970.

After getting this number of milliseconds, we can also calculate the current year, month, day, and week by ourselves, but this is not calculated by us, because there is Calendar. The final result of Calendar is the year, month, day, week, and hour Time zone.

System.currentTimeMillis() obtains the time distance from 1970-01-01 00:00:00.000 to the current moment, the type is long

String.valueOf(System.currentTimeMillis() ) This statement can be converted into the following format:

long ct = System.currentTimeMillis();

String t = String.valueOf(ct);

In fact, the above String t is equivalent to ct+"";

Convert knowledge to string format

public String refFormatNowDate(){

Date nowTime = new Date(System.currentTimeMillis() );

SimpleDateFormat sdFormatter = new SimpleDateFormat("yyy-MM-dd");

String retStrFormatNowDate = sdFormatter.format(nowTime);

return retStrFormatNowDate;

}

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