Creating a GregorianCalendar instance from milliseconds

Question

I have a certain time in milliseconds (in a Timestamp object) and I want to use it to create a GregorianCalendar object. How can I do that?

EDIT: How do I do the reverse?

Answer 1

Just get an instance of GregorianCalendar and setTime with your java.sql.Timestamp timestamp:

Calendar cal=GregorianCalendar.getInstance(); cal.setTime(timestamp); 

Edit: As peterh pointed out, GregorianCalendar.getInstance() will not provide a GregorianCalendar by default, because it is inherited fromCalendar.getInstance(), which can provide for example a BuddhistCalendar on some installations. To be sure to use a GregorianCalender use new GregorianCalendar() instead.

Answer 2

To get a GregorianCalendar object and not a Calendar object. Like Michael's answer provides, you can also do the following:

long timestamp = 1234567890; GregorianCalendar cal = new GregorianCalendar(); cal.setTimeInMillis(timestamp); 

This assumes a UTC epoch timestamp.