Github user gabrielreid commented on the pull request: https://github.com/apache/incubator-phoenix/pull/26#issuecomment-42072847 > It makes sense to use date cos you wanna get offset by timezone in some particular date - so you'll probably call this function on column with Date data type Timezones change for daylight savings at various times of day (typically at night), so a single date can have multiple timezone offsets. For this reason, it makes more sense to me to use a Timestamp as the parameter here.
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