Is there any method or script in JIRA REST API where i can set the created/modified date while creating issue.
No.
The REST API respects what the core of JIRA does. The created date is the date the issue was put into the system, and the updated date the last time it was updated. Neither of which are modifiable.
and the same strategy for comments also ?
Yes. It records the date you make the comment.
Actually i have bunch of Jsons imported issues from basecamp . So how could i able to create legacy of issues and comments to maintain my history of projects . is there any way ?
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