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  1. I have been working on a website where users from all around the world would post their suggestions, upload photos and create events for hangouts and so on. Its just like a social network. I need to how to store the Data and time of all the users in the correct format so that it would be the best choice for the future of the website. For example if a user in US creates an event then a person in india seeing it must be seeing it correctly in his time format. If he chooses to fly to US and login's in US then the time for the user in that specific timezone must match. The thing is any where the user may be, any time or date related activity in the website must store the time which can be common to all. I am aware of the two things, UTC and GMT where both are similary but with the DST. I dono which one to use wether to use GMT or UTC. Should i calculate time by adding or subtracting the offset, or coverting the timezone stored to the timezone of the user. I also need to know how to get the timezone or the offset of the user for a specific region. Thanks.
  2. I'm hoping someone might be able to help me with a new problem that has arisen on one of the sites I maintain. I'm getting a PHP error that says: "It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead." The funny thing is, the code has been in place for years and we've never gotten these errors. Suddenly they began popping up. I'm guessing maybe the host did an upgrade the the PHP version on the servers, but don't know for sure. I have a php.ini file for the site and it in I have tried everything I can think of, including: date.timezone=UTC date.timezone=America/Chicago date.timezone=US/Central When I look at the phpinfo() file the changes I make in my php.ini file are reflected, but I still get this error. What am I doing wrong? Any advice would be greatly appreciated. Thanks!
  3. I’m creating the auction site example from the last chapter of Modern Javascript. It’s a very good example to test one’s understanding of php and mysql queries. I’m struggling with the conversion of timezones. All my queries work fine except when I try to use CONVERT_TZ on any of the dates. For example the following query returns all my rows with a value for itemId, item and bid but null for the column which converts the date to the user's timezone. SELECT itemId, item, FORMAT(COALESCE(MAX(bid), openingPrice),2), IF (CONVERT_TZ(dateClosed, 'UTC', 'Asia/Tokyo') < DATE_ADD(UTC_TIMESTAMP(), INTERVAL 24 HOUR), DATE_FORMAT(dateClosed,'%l:%i %p'), DATE_FORMAT(CONVERT_TZ(dateClosed, 'UTC', 'Asia/Tokyo'), '%M %D @ %l:%i %p')) FROM items LEFT JOIN bids USING (itemId) GROUP BY itemId ORDER BY dateClosed I'm starting to think that I need to configure php or mysql in some way to deal with timezone conversion but I'm not sure in which folder to look for a timezone file. I did try entering this command in the terminal, and restarted MAMP but that did not work either. # mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root mysql Any ideas?
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