Here’s your notes JSON data:

{"pubkey":"7bf13da5730788d70f685cf7b21c95ebb0fdfdeea5e89c892eac4c28123f02a4","content":"Does nostr have timestamping? If I note something, can I later prove that I noted it at a specific time and date?","id":"e484b366087b55c701b1bcf32b0543058710115c0064ee7651424ee5eff37628","created_at":1682533679,"sig":"c03d919baeda3b21c450fa47ca9f7cdf3920182ef3b67307a0acc35e85c587c44a25a39f774324c933c8d298bba6041251597e9bf1e94610dadbd751da613a9b","kind":1,"tags":[]}

The created_at data is what you are

looking for. It’s in epoch date format can be converted to human readable date/time.