〜ことになっている expresses established rules, schedules, or customs — "it''s the rule that," "it''s supposed to be."
Rules/Regulations - It''s decided that...
Schedules - It''s arranged that...
Customs - It''s customary that...
Different from ことにしている (personal habit) — this is external rule/arrangement.
See examples below for varied real-world usage.
Dictionary form + ことになっている = rule/schedule exists
ない form + ことになっている = rule not to do
Related patterns:
• ことにしている = personal habit (self-decided)
• ことになっている = external rule/arrangement
It's arranged that we'll get married next month.
It's the rule to use Japanese in meetings.
In everyday context, It's arranged that we'll get married next month.
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