This is the code for showing the previous and next days, but only if they are created. So if you have June 26 and are on that note, but you don’t have the 25th or 27th created but you do have the 24th created, it will display something like this ← 2023-06-24 | 2023-W26 | (none) → with the middle one here being the week.

I took this dataviewjs code I found from the obsidian forums and modified it slightly:

class PreviousNextDay {
    base_path = "a journal/"

    display(dv) {
        var none = '(none)';
        var t = dv.current().file.day ? dv.current().file.day.toISODate() : luxon.DateTime.now().toISODate();

        var year = moment(t, format).format("YYYY");
        
        var p = dv.pages('"' + this.base_path + year + '"').where(p => p.file.day).map(p => [p.file.name, p.file.day.toISODate()]).sort(p => p[1]);

        // Obsidian uses moment.js; Luxon’s format strings differ!
        var format = app['internalPlugins']['plugins']['daily-notes']['instance']['options']['format'] || 'YYYY-MM-DD';

        var week_format = 'gggg-[W]WW';
        var week = moment(t, format).format(week_format);

        var nav = [];
        var today = p.find(p => p[1] == t);
        var next = p.find(p => p[1] > t);
        var prev = undefined;
        p.forEach(function (p, i) {
            if (p[1] < t) {
                prev = p;
            }
        });
        nav.push(prev ? '[[' + prev[0] + ']]' : none);
        nav.push(today ? '[[' + week + ']]' : "N/A");
        nav.push(next ? '[[' + next[0] + ']]' : none);

        dv.paragraph(' ← ' + nav[0] + ' | ' + nav[1] + ' | ' + nav[2] + ' → ');
    }
}

I use the plugins CustomJS, Dataview, and Templater to make this daily journal entry.

A few notes about this template:

• The file name is YYYY-MM-DD so I make an alias in the format of “Mon June 26 2023” so it’s easier for me to search for specific day later
• I use CustomJS to import my dataviewjs files to display the previous and next days, any birthdays for today, and any backlinks to this journal entry
• I used \ so this all displays in a single code block, don’t include these when using a template in obsidian

---
aliases: <% tp.date.now("ddd MMMM D YYYY", 0, tp.file.title, "YYYY-MM-DD") %>
title: 
day: <% tp.file.title %>
---

\```dataviewjs
const {PreviousNextDay} = customJS
PreviousNextDay.display(dv)
\```

---

# <% tp.date.now("ddd MMMM D YYYY", 0, tp.file.title, "YYYY-MM-DD") %>

\```dataviewjs
const {Birthdays} = customJS
Birthdays.display(dv)
\```

\```dataviewjs
const {Backlinks} = customJS
Backlinks.display(dv)
\```

## Journal

I’d recommend going into settings/options and having a look at the “Hotkeys” tab. There’s a lot of things that aren’t currently set, or default hotkeys that might be useful to you, like:

• Toggle pin - (not set by default) I set this to ctrl + shift + p which pins the current tab so it can’t be replaced with another tab
• Close current tab - By default it’s set to ctrl + w
• Command palette - opens the command palette. By default it’s set to ctrl + p. The command palette is amazing because it shows you everything in the “Hotkeys” tab. So you don’t even need a hotkey set to use something. Like you can open the command palette and search for “release notes” and it will show you the current release notes. If you have the emoji plugin installed, you can open the command palette and search for “emoji” and it will open the emoji toolbar.
• Quick switcher - search by note title. By default it’s set to ctrl + o. But I have the Omnisearch plugin installed so I set this hotkey to that instead.

The plugin QuickAdd is really useful here as well, you can create your own hotkeys. I made one so when I press ctrl + n it creates a new note in a specific folder with today’s date and time as the file name, so I can quickly write something down.