import time
import random

BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

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

def generate_id():
    epoch_start = int(time.mktime((2020, 1, 1, 0, 0, 0, 0, 0, 0))) * 1000
    now = int(time.time() * 1000) - epoch_start
    random_num = random.randint(0, 999)  # 3-digit random number
    id_num = now * 1000 + random_num  # Combine timestamp + randomness
    return to_base62(id_num).zfill(8)[:8]  # Ensure 8 chars

print(generate_id())  # Example output: "8F2T5MkQ"