Different commands about showing last reboot have different opinions. Who is right?

```
# uptime
 10:05:31 up 90 days, 12:59,  2 users,  load average: 0.04, 0.02, 0.00

# who -b
             system boot  2018-11-22 21:05
# last reboot

wtmp begins Sat Feb  2 01:59:42 2019

```