[Java] java formatting time to milliseconds

Java code  

java.text.SimpleDateFormat sdf=new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS");

The various date representation letters in JAVA are as follows:

G	Era symbol	Text	AD
y	year	Year	1996; 96
M	Month of the year	Month	July; Jul; 07
w	Week of the year	Number	27
W	Week number of month	Number	2
D	Number of days in the year	Number	189
d	Days in month	Number	10
F	Day of the month	Number	2
E	Days of the week	Text	Tuesday; Tue
a	Am/pm mark	Text	PM
H	The number of hours in a day (0-23)	Number	0
k	Number of hours in a day (1-24)	Number	24
K	Hours in am/pm (0-11)	Number	0
h	Hours in am/pm (1-12)	Number	12
m	Minutes in hour	Number	30
s	Seconds in minutes	Number	55
S	Milliseconds	Number	978
z	Time zone	General time zone	Pacific Standard Time; PST; GMT-08:00
Z	Time zone	RFC 822 time zone	-0800

 Reference article

https://www.cnblogs.com/jpfss/p/9480818.html