how to find seconds since 1970 in java

Question

iam working with a real time project where i got a requirement to find seconds since 1970 january 1.I have used the following code to find out seconds but is giving wrong result.The code is as follows.

public long returnSeconds(int year, int month, int date) {     Calendar calendar1 = Calendar.getInstance();     Calendar calendar2 = Calendar.getInstance();     calendar1.set(1970, 01, 01);     calendar2.set(year, month, date);     long milliseconds1 = calendar1.getTimeInMillis();     long milliseconds2 = calendar2.getTimeInMillis();     long diff = milliseconds2 - milliseconds1;     long seconds = diff / 1000;     return seconds; } 

In the above in place of year,month,date I'm passing 2011,10,1 and iam getting

1317510000 

but the correct answer is

1317427200 

Any help regarding this is very useful to me.

Answer 1

The methods Calendar.getTimeInMillis() and Date.getTime() both return milliseconds since 1.1.1970.

For current time, you can use:

long seconds = System.currentTimeMillis() / 1000l; 

Answer 2

Since Java8:

java.time.Instant.now().getEpochSecond()