问题描述:

In java, I want to know that what is the best practice to keep date info for display, query, report etc. It seems that if we persist as long, all timezone dependency will be removed and we will keep 'persist globally, display locally' principle since Date object automatically converts long to current timezone.

But what is the advantage of persisting as Date object?

Do I loose any info other than info owner's timezone?

Can I get any wrong info when DLS takes into account?

Difference between persisting as UTC date and long is just readable db info?

网友答案:

Depending on your database you should use either TIMESTAMP WITH TIMEZONE or you convert it to UTC time and store it as long.

The first one relies on the DB to handle it correctly (the DB will, but will your DB driver? You have to test this for your setup). The second one makes it a manual process, you will get the correct result in the end but will have more hazzle with it because you have to take care about everything.

Inside Java you might want to use Calendar over Date because there you can specify the TIMEZONE etc. manually, thus you are able to display Dates in timezones different to your own easier.

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