java timestamp and PHP timestamp

Due to different precisions, the lengths are inconsistent and direct conversion errors occur.戳Java timestamp length is 13 digits, such as: 1294890876859
Php timestamp length is 10 bits, such as: 1294890859

Php

echo date ('y-m-d h: s', '1294890876'); PHP timestamp is used in JAVA, add three digits at the end and supplement it with 000, such as: 1294890859->1294890859000

java code

Java code

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH: mm:ss");

String dateTime = df.format(1294890859000L);

System.out.println(df);