[jira] [Created] (FLINK-13280) Revert blink changes in DateTimeUtils, and keep it same as flink version.

["Zhenghua Gao (JIRA)" <ji...@apache.org>]

Zhenghua Gao created FLINK-13280:
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             Summary: Revert blink changes in DateTimeUtils, and keep it same as flink version.
                 Key: FLINK-13280
                 URL: https://issues.apache.org/jira/browse/FLINK-13280
             Project: Flink
          Issue Type: Sub-task
            Reporter: Zhenghua Gao
             Fix For: 1.9.0, 1.10.0


            This class have some diff between flink/blink planner:
 * Blink intros some constants (e.g., MICROS_PER_DAY, SECONDS_PER_DAY), inner use, it does not matter.
 * Blink intros a function unixDateTimeToString (new)
 * Blink changes the behavior of some function
 * dateStringToUnixDate: only used in test & codegen now, can be moved into another util class
 * timeStringToUnixDate: only used in test & codegen now, can be moved into another util class


 * Blink intros USER TimeZone, but now it’s always UTC TimeZone, so it does not matter



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