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  1. Spark
  2. SPARK-26651

Use Proleptic Gregorian calendar

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Details

    • Umbrella
    • Status: Resolved
    • Major
    • Resolution: Done
    • 2.4.0
    • None
    • SQL

    Description

      Spark 2.4 and previous versions use a hybrid calendar - Julian + Gregorian in date/timestamp parsing, functions and expressions. The ticket aims to switch Spark on Proleptic Gregorian calendar, and use java.time classes introduced in Java 8 for timestamp/date manipulations. One of the purpose of switching on Proleptic Gregorian calendar is to conform to SQL standard which supposes such calendar.

      Release note:

      Spark 3.0 has switched on Proleptic Gregorian calendar in parsing, formatting, and converting dates and timestamps as well as in extracting sub-components like years, days and etc. It uses Java 8 API classes from the java.time packages that based on ISO chronology . Previous versions of Spark performed those operations by using the hybrid calendar (Julian + Gregorian). The changes might impact on the results for dates and timestamps before October 15, 1582 (Gregorian).

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              maxgekk Max Gekk
              maxgekk Max Gekk
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                Updated:
                Resolved: