[letsencrypt] Log should include full timestamp (i.e. including "date")

### Describe the issue you are experiencing

The log written by the "letsencrypt" plugin only contains the time, not the "date". This is not following the best practices, the date may be required when investigating issues.

### What type of installation are you running?

Home Assistant OS

### Which operating system are you running on?

Home Assistant Operating System

### Which app are you reporting an issue with?

Let's Encrypt

### What is the version of the app?

6.3.2

### Steps to reproduce the issue

1. Install the app.
2. Configure the app.
3. Observe that the log contains only timestamps, lacking the date.
...

### System Health information

## System Information

version | core-2026.6.3
-- | --
installation_type | Home Assistant OS
dev | false
hassio | true
docker | true
container_arch | amd64
user | root
virtualenv | false
python_version | 3.14.5
os_name | Linux
os_version | 6.12.85-haos
arch | x86_64
timezone | Europe/Berlin
config_dir | /config

Home Assistant Community Store

GitHub API | ok
-- | --
GitHub Content | ok
GitHub Web | ok
HACS Data | ok
GitHub API Calls Remaining | 4996
Installed Version | 2.0.5
Stage | running
Available Repositories | 3152
Downloaded Repositories | 3

Home Assistant Cloud

logged_in | false
-- | --
can_reach_cert_server | ok
can_reach_cloud_auth | ok
can_reach_cloud | ok

Home Assistant Supervisor

host_os | Home Assistant OS 17.3
-- | --
update_channel | stable
supervisor_version | supervisor-2026.06.2
agent_version | 1.8.1
docker_version | 29.3.1
disk_total | 30.8 GB
disk_used | 14.2 GB
nameservers | 192.168.2.1, fd94:2ff5:9671::1
healthy | true
supported | true
host_connectivity | true
supervisor_connectivity | true
ntp_synchronized | true
virtualization | kvm
board | ova
supervisor_api | ok
version_api | ok
installed_addons | Prometheus Node Exporter (3.0.0), Let's Encrypt (6.3.2), File editor (6.0.0), Cloudflared (7.0.8), Syslog (0.4.1), OpenThread Border Router (3.0.1), Matter Server (8.5.0), Mosquitto broker (7.1.0)

Dashboards

dashboards | 2
-- | --
resources | 0
views | 2
mode | storage

Network Configuration

adapters | lo (disabled), enp6s18 (enabled, default, auto), hassio (disabled), docker0 (disabled), veth825781a (disabled), veth8bdf17c (disabled), vethe3efa04 (disabled), vethd667244 (disabled), vethf112caf (disabled), vethd98dfcf (disabled), veth76cfbc7 (disabled), vetheb3be25 (disabled), vethfb9c5b9 (disabled), veth5ffee51 (disabled), wpan0 (disabled)
-- | --
ipv4_addresses | lo (127.0.0.1/8), enp6s18 (192.168.2.205/24), hassio (172.30.32.1/23), docker0 (172.30.232.1/23), veth825781a (), veth8bdf17c (), vethe3efa04 (), vethd667244 (), vethf112caf (), vethd98dfcf (), veth76cfbc7 (), vetheb3be25 (), vethfb9c5b9 (), veth5ffee51 (), wpan0 ()
ipv6_addresses | lo (::1/128), enp6s18 (fd94:2ff5:9671:0:352b:9796:1633:1a01/64, fe80::e412:d528:c494:aeeb/64), hassio (fd0c:ac1e:2100::1/48, fe80::c8a4:9dff:fe1e:32cc/64), docker0 (fe80::1c01:deff:fe0b:4f6d/64), veth825781a (fe80::ce2:20ff:fe88:abc8/64), veth8bdf17c (fe80::e0bd:cdff:fe72:6e95/64), vethe3efa04 (fe80::8f:28ff:fe91:a07e/64), vethd667244 (fe80::467:bff:fe3f:eef6/64), vethf112caf (fe80::7ca1:61ff:fe05:a7d7/64), vethd98dfcf (fe80::64a1:c8ff:fe67:2549/64), veth76cfbc7 (fe80::5453:c5ff:fe55:c7c6/64), vetheb3be25 (fe80::3469:a6ff:fedb:2d26/64), vethfb9c5b9 (fe80::ec7c:b3ff:fe19:fe4e/64), veth5ffee51 (fe80::7483:c8ff:fe9c:aca6/64), wpan0 (fd89:9ade:183b:e901:0:ff:fe00:fc11/64, fd09:9fd:3c61:1:2bf8:47d5:e8cf:96b5/64, fd89:9ade:183b:e901:0:ff:fe00:fc38/64, fd89:9ade:183b:e901:0:ff:fe00:fc10/64, fd89:9ade:183b:e901:0:ff:fe00:5400/64, fd89:9ade:183b:e901:1535:c6ee:aebd:646d/64, fe80::e499:32c:6c17:3e75/64)
announce_addresses | 192.168.2.205, fd94:2ff5:9671:0:352b:9796:1633:1a01, fe80::e412:d528:c494:aeeb

Recorder

oldest_recorder_run | June 10, 2026 at 01:15
-- | --
current_recorder_run | June 17, 2026 at 03:15
estimated_db_size | 346.58 MiB
database_engine | sqlite
database_version | 3.49.2

### Anything in the Supervisor logs that might be useful for us?

```txt

```

### Anything in the app logs that might be useful for us?

```txt

```

### Additional information

_No response_

Review the Let's Encrypt app logs and the add-on's logging configuration, then reproduce the issue to find where timestamps are formatted. Done means log entries include the full date as well as the time, while the add-on continues to start and operate normally.

Written by the indexing model from the issue text.