You cannot legitimately backdate iOS system time to alter app behavior, receipts, logs, or security checks
You can manually change the device date and time in Settings if you need a different local time for testing
You can turn off Set Automatically in Settings > General > Date & Time
You can set the date and time manually after disabling automatic time
You can change the time zone in Settings > General > Date & Time
You can use Xcode simulators to test different dates and times
You can use test environments or mock time in your app code for development
You should not use date changes to bypass app restrictions, subscriptions, or security controls