Hi all,

I'm trying to get a date out of the columns year and week. The week format is not recognized.  

df_loaded = df_loaded.withColumn("week_year", F.concat(F.lit("3"),F.col('Week'), F.col('Jaar')))

df_loaded = df_loaded.withColumn("date", F.to_date(F.col("week_year"), "uwwyyyy"))

I'm getting this error:

But it doesn't work and I get this error:

SparkUpgradeException: You may get a different result due to the upgrading of Spark 3.0: Fail to recognize 'uwwyyyy' pattern in the DateTimeFormatter. 1) You can set spark.sql.legacy.timeParserPolicy to LEGACY to restore the behavior before Spark 3.0. 2) You can form a valid datetime pattern with the guide from https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html

Any ideas how to get from columns week & year to date in pyspark?