java - How to unify date format using DateTimeFormatter -


i need parse different time format basic_iso_date. right now, there 4 types of date format:

  • 2016-10-01 (iso_local_date)
  • 2016t
  • 201610t
  • 2016-02-07t22:03:39.937z (iso 8601)

need parse 20161001 , print out, default day 01, default month jan. examples:

  • 2016t -> 20160101
  • 201610t -> 20161001

how can use datetimeformatter achieve this?

just complement @flown's answer (which works btw), can use optional patterns (delimited []):

datetimeformatter parser = new datetimeformatterbuilder()     // optional iso8601 date/time , offset     .appendoptional(datetimeformatter.iso_offset_date_time)     // optional yyyy-mm-dd or yyyyt or yyyymmt     .appendpattern("[yyyy-mm-dd][yyyy't'][yyyymm't']")     // default day 1     .parsedefaulting(chronofield.day_of_month, 1l)     // default month january     .parsedefaulting(chronofield.month_of_year, 1l)     // create formatter     .toformatter();

this works same way. can choose 1 clearer or easier maintain. if there lots of different patterns, using [] might end being more confusing, imo.

note used iso_offset_date_time instead of iso_zoned_date_time. difference iso_zoned_date_time accepts timezone name in end (like [europe/london]), while iso_offset_date_time doesn't. check javadoc more info.


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