Question

SimpleDateFormat format = new SimpleDateFormat("GD_yyyyMMdd_HHmmss");
    System.out.println(format.format(new Date()));

I want a result like 'GD_20120604_164534'but the result is AD156_20120604_165315

how to set the param can return my willing result.thanks advance!

Answer 1

G is an era designator and D represents day, as specified in the SimpleDateFormat reference, and:

Text can be quoted using single quotes (‘) to avoid interpretation. “”” represents a single quote.

Change to:

SimpleDateFormat format = new SimpleDateFormat("'GD_'yyyyMMdd_HHmmss");