EX3400 or Ex2300 are shipped with Junos OS 15.1X53-D50 and shows the incorrect time. This article provides a temporary workaround.

The following was observed:

• Running the command, show system uptime displays the time as 2038
• JDHCP process is high
• High CPU utilization
• Dot1x does not work as expected.
• Failure in forming aggregated interface with LACP enabled.

show system uptime
fpc0:
---------------------------------------------------------------------
Current time: 2038-01-19 10:14:07 IST
Time Source: NTP CLOCK
System booted: 2038-01-19 10:14:07 IST (3d 06:28 ago)
Protocols started: 2038-01-19 10:14:07 IST (00:-2:-24 ago)
Last configured: 2038-01-19 10:14:07 IST (-13:-27:-55 ago) by junos2
7:51AM up 3 days, 6:28, 1 users, load averages: 0.55, 0.46, 0.42

Upgrade Junos OS to 15.1X53- D56 or Check recommended release in Juniper.net 

Temporary workaround for Junos OS 15.1X53- D50

1. Set the initial date to the current date from the CLI.
2. Enable NTP

rtc8564je_rtc0: RTC ERROR(16): read failed for off:2(len:1)
rtc8564je_rtc0: SETTIME failed for seconds: error 16
warning: clock_settime failed (16), time-of-day clock not adjusted to system time

Note: After rebooting, the system falls back to time displayed as 2038.  The permanent solution is to upgrade to Junos OS 15.1X53- D56 or higher
Even upgrade fails due to this RTC error so please "set date " manually and then upgrade.
For upgrade space constraints refer KB31198 [juniper.net]