CSV Import with date field fails to import when dates are within the last 2 days

This issue relates to JRA-42259 / JIM-1461

Clarification

This bug affects CSV Issue Importer

• Click on the issue drop down from the top panel and select Import Issues from CSV

  <BASE URL>/secure/BulkCreateSetupPage!default.jspa?externalSystem=com.atlassian.jira.plugins.jira-importers-plugin:bulkCreateCsv
  

It DOES NOT affects External System Import's CSV Importer:

• g + g > External System Import > CSV Import

  https://clone-ribesalat.atlassian.net/secure/admin/CsvSetupPage!default.jspa?externalSystem=com.atlassian.jira.plugins.jira-importers-plugin:csvImporter
  

Problem Description

When Importing from CSV file, it fails to create issue for the issues that requires custom field to store the value of the date of today and tomorrow.

Steps to replicate

1. Create a CSV File with the following content:

   Summary,Start Date,Due Date,Issue Type
   TEST5,20150505,20150505,Task
   TEST6,20150506,20150506,Task
   TEST7,20150507,20150507,Task
   TEST8,20150508,20150508,Task
   TEST9,20150509,20150509,Task
   TEST10,20150510,20150510,Task
   TEST11,20150511,20150511,Task
   TEST12,20150512,20150512,Task
   

2. Create a Date Picker custom field
3. Navigate to the CSV Importer page (Click on the issue drop down from the top panel and select Import Issues from CSV)
4. Select the CSV file created on Step 1 with the date format yyyyMMdd
5. Map all the respective field, (Start Date to the date field on step 2)
6. Run a validation is enough to show the error:

   The validation process has found 1 error/s
   
   Issue can't be created due to the error/s [ You did not enter a valid date. Please enter the date in the format "d/MMM/yy", eg. "6/May/15" ]
   

   On the logs

   2015-05-06 15:28:26,116 INFO - Importer started!
   2015-05-06 15:28:26,116 INFO - Engine is running in Validation-only mode
   2015-05-06 15:28:26,123 INFO - All issues will be imported to project: OP - Germany (OPG)
   2015-05-06 15:28:26,123 INFO - Creating issue: ExternalIssue{externalId=autoid-1543422131194881929, summary=TEST5, issueType=Task}
   2015-05-06 15:28:26,138 ERROR - Issue can't be created due to the error/s [ You did not enter a valid date. Please enter the date in the format "d/MMM/yy", eg. "6/May/15" ]
   2015-05-06 15:28:26,138 INFO - Creating issue: ExternalIssue{externalId=autoid-8688065971629025157, summary=TEST6, issueType=Task}
   2015-05-06 15:28:26,150 ERROR - Issue can't be created due to the error/s [ You did not enter a valid date. Please enter the date in the format "d/MMM/yy", eg. "6/May/15" ]
   2015-05-06 15:28:26,151 INFO - Creating issue: ExternalIssue{externalId=autoid-4634509001815587972, summary=TEST7, issueType=Task}
   2015-05-06 15:28:26,162 INFO - No problems found with issue 'TEST7'
   ...
   

Workaround

Use the External System Import for the moment (Requires Administrative permission).

g + g > External System Import > CSV Import