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Adding Timezone Support to a PHP based production app

+2 votes

I have an app with users in one timezone with the date / time stored in their location. Now there are more users in more locations and I would like to support them - ideally without changing to historical data.

At the moment the app uses a time offset field to allow two people to see one note expressed in their timezone.

There are two use cases for this one is the free/busy calendar, the other is the meeting invite ICS file.

At the moment I would like to support ICS which are GMT based.

My guess is that:

  • Assign each user to their own timezone
  • I take the diary row ($start_date, $start_time) and convert it to a GMT timestamp
  • Make the ICS file

I am keen to hear of better solutions or ideas.

posted Feb 23, 2015 by anonymous

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