How to set default time zone in Java and control the way date are stored on DB?
I've the following problem, that showed up when I installed my webapp's war on a virtual linux server. Here it is: my server system time seems correct, in fact typing date on shell comes out with:
Mon Apr 11 11:47:30 CEST 2011
which is my "wall clock time". Even mysql works fine, if I do select now(), I get:
mysql> select now()
-> ;
+---------------------+
| now() |
+---------------------+
| 2011-04-11 11:52:57 |
+---------------------+
1 row in set (0.01 sec)
But my application (Spring+hibernate on Java6 + tomcat 6) will save every date on DB with a GMT timezone (and the time is correctly offset with the difference from GMT, which is good). Now the problem is that I get all dates displayed with GMT, even if I do:
static final DateFormat format = new SimpleDateFormat(
"dd/MM/yyyy 'alle' HH:mm", Locale.ITALY);
I don't get the hours correctly offset, but they remain in GMT and they display GMT if I put Z (that displays timezone) in the pattern.
Under Windows instead I had date values stored in my native timezone on mySQL. So on my windows machine where I develop I will have all the dates in CEST. This is annoying as I don't know how to predict the way the system will behave and I have to do boring tests and figur开发者_Go百科e out how to change this.
Do you have ever seen this problem? How to deal with it?
DateFormat does support a notion of time zone. Add something like:
format.setTimeZone(TimeZone.getTimeZone("Europe/Rome");
SimpleDateFormat sf1 = new SimpleDateFormat("dd/MM/yyyy 'alle' HH:mm:ss");
sf1.setTimeZone(TimeZone.getTimeZone("Europe/Rome"));
System.out.println(sf1.format(new Date()));
// List all Timezone
System.out.println(Arrays.asList(TimeZone.getDefault()));
DateFormat
does not care about time zones, only formatting. In order to change to timezone you need something like Calendar.setTimezone().
PreparedStatement st = con .prepareStatement("insert into knjiga_osisi (rb_knjiz,Inv_br,Naziv_os,datum_k,rb_pk,opis,ulaz,izlaz,stanje,osnovica_zam,otpis,sadasnjav, vrednost_pp,rashodovanav) values (?,?,?,STR_TO_DATE(?, '%d-%m-%Y'),?,?,?,?,?,?,?,?,?,?)");
This is code for java. Mysql - java european date format
This line is for date
STR_TO_DATE(?, '%d-%m-%Y')
U can test in mysql only date row:
SELECT ID, DATE_FORMAT(Date, '%d-%M-%Y') FROM table1;
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