When you start a subscription, only posts within 30 days before the subscription start date can access.  

You can access past postings exceed 30 days ago to buy unlock Ticket  

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When you retain a subscription, you can continue to view posts for the duration of the subscription, and if you unsubscribe and re-subscribe, you can access only posts within 30 days prior to the new subscription date.

Subscription starts on July 1st -> Can access the post updated from June 2nd to subscription termination day.

Subscription starts on July 1st, terminates on August 31st, subscription starts again on October 1st, -> Posts uploaded after September 2nd can access