[GitHub] [airflow] SamWheating edited a comment on issue #17906: Some timezones in Web UI shows as number, not timezone name

[GitBox <gi...@apache.org>]

SamWheating edited a comment on issue #17906:
URL: https://github.com/apache/airflow/issues/17906#issuecomment-909719331


   This comes down to the intended behaviour of [moment-timezone](https://github.com/moment/moment-timezone), the JS package used for handling timezones in the UI. Here's the part of the source which populates that field:
   https://github.com/apache/airflow/blob/dd386c81f50fe2a93cf0bff0c3da2c66f2dc6e6a/airflow/www/static/js/datetime_utils.js#L23-L33
   
   
   You can replicate this behaviour by running the relevant line of code in the javascript console of the Airflow webserver:
   ```javascript
   > moment().tz("America/Vancouver").format('z (Z)')
   "PDT (-07:00)"
   
   > moment().tz("Chile/Continental").format('z (Z)')
   "-04 (-04:00)"
   ```
   
   Looking into the discussion in [this issue](https://github.com/moment/moment-timezone/issues/841) on moment-timezone, I believe that this is intended behaviour for some timezones due to this [ICANN change from 2017](https://mm.icann.org/pipermail/tz-announce/2017-February/000045.html) in which it was decided to use numeric abbreviations for many South American time zones.


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