Pi suddenly stopped working

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Sorry, I noticed current distro's with systemd use below one for time sync instead of old fashion ntpd:

$ man systemd-timesyncd.service
[..]
DESCRIPTION
       systemd-timesyncd is a system service that may be used to
       synchronize the local system clock with a remote Network Time
       Protocol server. It also saves the local time to disk every time
       the clock has been synchronized and uses this to possibly
       advance the system realtime clock on subsequent reboots to
       ensure it monotonically advances even if the system lacks a
       battery-buffered RTC chip.

If want to know if systemd-timesyncd is active:

$ sudo service systemd-timesyncd status
● systemd-timesyncd.service - Network Time Synchronization
   Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled
  Drop-In: /lib/systemd/system/systemd-timesyncd.service.d
           └─disable-with-time-daemon.conf
   Active: active (running) since Mon 2019-06-03 07:50:04 CEST; 3 weeks 0

If want to check if its configured to sync:

$ timedatectl
[..]
 Network time on: yes
NTP synchronized: yes
 RTC in local TZ: no

NTP servers need to be configured here on the "NTP=" line:

$ cat /etc/systemd/timesyncd.conf
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See timesyncd.conf(5) for details.

[Time]
#NTP=
#FallbackNTP=0.debian.pool.ntp.org 1.debian.pool.ntp.org 2.debian.pool.ntp.org 3.debian.pool.ntp.org

Eg.

NTP=109.236.82.30 95.211.212.5 80.100.130.235 149.210.142.45

EDIT: Ow and for the record, if you still have ntpd installed (apt policy ntp), below one is holding systemd-timesyncd back:

pi@noads:~ $ cat /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
[Unit]
# don't run timesyncd if we have another NTP daemon installed
ConditionFileIsExecutable=!/usr/sbin/ntpd
ConditionFileIsExecutable=!/usr/sbin/openntpd
ConditionFileIsExecutable=!/usr/sbin/chronyd
ConditionFileIsExecutable=!/usr/sbin/VBoxService

To switch:

sudo service ntp stop

sudo apt remove ntp

sudo service systemd-timesyncd restart

sudo service systemd-timesyncd status

timedatectl

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