how to get the number of seconds passed since 1970 for a date value?
Solution 1:
System.currentTimeMillis() gives you the number of milliseconds since the Unix epoch (January 1, 1970 00:00:00 UTC).
Divide it by 1000 to get the number of seconds.
Solution 2:
//long currentTimeMillis ()-Returns the current time in milliseconds.
long millis = System.currentTimeMillis();
//Divide millis by 1000 to get the number of seconds.
long seconds = millis / 1000;