import time
import random
import string

BASE62 = string.digits + string.ascii_uppercase + string.ascii_lowercase

def to_base62(num):
    encoded = ""
    while num > 0:
        encoded = BASE62[num % 62] + encoded
        num //= 62
    return encoded

def generate_id():
    epoch_start = int(time.mktime((2020, 1, 1, 0, 0, 0, 0, 0, 0))) * 1000
    now = int(time.time() * 1000)
    timestamp = (now - epoch_start) % 1_000_000_000_000  # Keep last 12 digits

    random_num = random.randint(0, 99)  # 2-digit random number
    final_num = timestamp * 100 + random_num

    return to_base62(final_num).zfill(8)  # Ensure 8-char output

print(generate_id())  # Example output: "A1b2C3D4"