Jackie-Jiang opened a new issue, #8632:
URL: https://github.com/apache/pinot/issues/8632

   Currently the date time format is of the format:
   - `<size>:<timeUnit>:<timeFormat>(:<pattern>( tz(<timezone>))`
   
   E.g.
   - `1:SECONDS:EPOCH`
   - `1:DAYS:SIMPLE_DATE_FORMAT:yyyy-MM-dd tz(America/Chicago)`
   - `1:MILLISECONDS:TIMESTAMP`
   
   The problem of this format is that for certain time format, the size and 
time unit is implicit, and will cause confusion.
   
   The proposal is to change the time format to:
   - `EPOCH|<timeUnit>(|<size>)`
     - `EPOCH|SECONDS`
     - `EPOCH|MINUTES|5`
   - `SDF|<timeFormat>(|<timezone>)`
     - `SDF|yyyy-MM-dd`
     - `SDF|yyyy-MM-dd'T'HH:mm:ss'Z'|America/Chicago`
   - `TIMESTAMP`
   
   We want to change the delimiter so that it won't be mixed with the character 
in the time format


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