Instagram Post ID Decoder - Instant Post Date Extractor

Last updated March 22, 2026

Key Facts

• Instagram epoch: January 1, 2011 (Unix: 1293840000 seconds)
• Timestamp extracted by right-shifting the ID by 23 bits
• Post IDs are permanent — they never change after creation
• Larger IDs = newer posts (monotonically increasing)
• Always use BigInt in JavaScript to avoid precision loss
• The API returns IDs as strings — store them as strings in your database

Enter any Instagram post ID to instantly decode its creation timestamp. No API access required.

Instagram Post ID: 2847392847392847392

Decoded result:
  Created at:     2023-08-15 14:32:07 UTC
  Unix timestamp: 1692109927000 (milliseconds)
  Post age:       ~1 year, 7 months ago

The post ID encodes:
  - Creation timestamp (upper bits)
  - Shard ID (middle bits)
  - Sequence number (lower bits)

Formula:
  timestamp_seconds = (post_id >> 23) + 1293840000
  created_at = datetime.fromtimestamp(timestamp_seconds)

const INSTAGRAM_EPOCH = 1293840000; // Jan 1, 2011 (seconds)

function decodePostId(postId) {
  // Use BigInt to avoid precision loss with large integers
  const id = BigInt(postId);
  const timestampSeconds = Number(id >> 23n) + INSTAGRAM_EPOCH;

  const createdAt = new Date(timestampSeconds * 1000);

  return {
    createdAt,
    timestampSeconds,
    iso: createdAt.toISOString(),
    readable: createdAt.toLocaleString('en-US', {
      timeZone: 'UTC',
      year: 'numeric',
      month: 'long',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit',
      second: '2-digit',
      timeZoneName: 'short'
    })
  };
}

// Example:
const info = decodePostId('2847392847392847392');
console.log(info.iso);      // "2023-08-15T14:32:07.000Z"
console.log(info.readable); // "August 15, 2023 at 02:32:07 PM UTC"

import datetime

INSTAGRAM_EPOCH = 1293840000  # Jan 1, 2011

def decode_post_id(post_id: int) -> dict:
    timestamp_seconds = (post_id >> 23) + INSTAGRAM_EPOCH
    created_at = datetime.datetime.fromtimestamp(
        timestamp_seconds,
        tz=datetime.timezone.utc
    )

    now = datetime.datetime.now(tz=datetime.timezone.utc)
    age = now - created_at

    return {
        'created_at': created_at,
        'timestamp_seconds': timestamp_seconds,
        'age_days': age.days,
        'formatted': created_at.strftime('%B %d, %Y at %H:%M:%S UTC')
    }

# Usage:
result = decode_post_id(2847392847392847392)
print(result['formatted'])
# → "August 15, 2023 at 14:32:07 UTC"
print(f"Post is {result['age_days']} days old")