Incorrect api response for time format in freshsales

Hi team,
we are developing an integration on freshdesk to display Freshsales Activities. The date format in the response we get from Freshsales API (crm/sales/contacts/{contactId}/sales_activities) differs in two different instances.

the above screenshot shows the API response of sales activities from a enterprise level trial account.

the above screenshot is the API Response from a trail that we have subscribed.

Why does the API response contains two different time formats for the “due date” property? is it the default behaviour of the APIs based on the account’s data centers? can anybody please help on this issue?