hotienvu commented on pull request #6233:
URL: https://github.com/apache/incubator-pinot/pull/6233#issuecomment-722239601
Since the output we want is millis since epoch, this would still work
regardless of whether user specify a time zone or not.
```
DateTimeFormat.forPattern("yyyyMMdd HH:mm:ss
Z").withZoneUTC().parseMillis("19710101 00:00:00 +0800") -> 31507200000
DateTimeFormat.forPattern("yyyyMMdd HH:mm:ss Z").parseMillis("19710101
00:00:00 +0800") -> 31507200000
```
However if we don't specify time timezone and our locale is not UTC e.g +0800
```
DateTimeFormat.forPattern("yyyyMMdd HH:mm:ss").parseMillis("19710101
00:00:00") -> 31509000000
DateTimeFormat.forPattern("yyyyMMdd
HH:mm:ss").withZoneUTC().parseMillis("19710101 00:00:00") -> 31536000000
```
So I think it's better to enforce UTC in this case
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