Sweden keeps Central European Time in winter and moves an hour ahead from the last Sunday in March to the last Sunday in October. India does not change, so Gothenburg is four and a half hours behind IST in winter and three and a half in summer. A Gothenburg purchasing day from 08:00 to 16:30 is 12:30 to 21:00 IST in winter.
Many business buyers in Gothenburg read English, so English (en) templates are a sensible default for B2B updates. Swedish (sv) is worth a version when you write to consumers or to plant staff rather than purchasing teams. Meta approves each language version of a template separately.
Promotional messages to Swedish contacts fall under the Marketing Act and the GDPR as well as Meta's opt-in rule; the Sweden guide explains what each requires. Updates about a buyer's own orders are utility messages and need only their agreement to receive them.