fix(OAIService): always print header's datestamp with 'yyyy-MM-dd'T'HH:mm:ss'Z' format

assigned to @Hugues.Cazeaux

added 2 commits

• 760e9305 - 1 commit from branch 2.7-maintenance
• 5f330ef4 - fix(OAIService): always print header's datestamp with 'yyyy-MM-dd'T'HH:mm:ss'Z' format

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added 1 commit

• ca5ec2a0 - refactor

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merged