On 30/11/16 17:27, Pablo Sánchez wrote:
I have a doubt about the TZ database release or updates, and maybe you can help me to solve it.
So, is the database update BEFORE or AFTER a new DST has started? The reason why I need to know it is because we are having issues about calculating some ETAs and presenting the information on reports, because PHP internal database doesn't get updates automatically. So we decided to use an extension that uses IANA's Timezone Database (updated approximatelly 23 times an year). So, we need to know if those updates are released before the daylight saving time starts or if you release it before it starts. Since there are usually political decisions that delays or rushes the DST beginning, I believe those updates comes prior to the actual fact, with a data on wich day begin, so I should not worry on using the extension that updates itself with 24 hours delay, right?
So, do you update it before DST comes, or after?
It would make little or no sense to publish a tzdata update after the changes in it take effect. Whenever possible changes are pushed out as soon as they are confirmed which is before the time transition will take effect. On a few memorable occasions a government has changed the timezone with no notice at all and that has caused problems for everyone involved. jch