obsidian.templater.date-basis.js

<%*
const dateFormat = "YYYY-MM-DD";
const dateBasisStr = await tp.system.prompt("When is the meeting?");

if (dateBasisStr) {
    function createMessage(daysBefore, dateFormat, dateBasisStr) {
        let parseResult;
        let newDate;
        let parseResultLink;
        let nlDatesPlugin = app.plugins.getPlugin('nldates-obsidian');
        parseResult = nlDatesPlugin.parseDate(dateBasisStr);
        newDate = window.moment(parseResult.formattedString).add((daysBefore * -1), 'days').format(dateFormat);
        if (newDate) {
            if (newDate !== 'Invalid date') { parseResultLink = '[' + '[' + newDate + ']]'; }
        }
        if (parseResultLink) {
            return parseResultLink;
        } else {
            return "";
        }
    }

let msgDate;
msgDate = createMessage(14, dateFormat, dateBasisStr);
tR += `Send agenda on ${msgDate}`

//Repeat to add multiple lines / dates
msgDate = createMessage(7, dateFormat, dateBasisStr);
tR += `\n`;
tR += `Send reminder on ${msgDate}`

msgDate = createMessage(1, dateFormat, dateBasisStr);
tR += `\n`;
tR += `Tomorrow is the meeting! ${msgDate} will remind me!`

}
%>

This is wonderful. I can see where it can be customised. The next challenge would be if you wanted to generate more than one line with different dates relative to the date basis.

The next challenge would be if you wanted to generate more than one line with different dates relative to the date basis.

@kmaustral I just updated the code to allow for adding multiple lines with different dates and messages. It uses a function now so can just repeat as few or many times as you want by copying these 3 lines and repeating:

//Repeat to add multiple lines / dates
msgDate = createMessage(7, dateFormat, dateBasisStr);
tR += `\n`;
tR += `Send reminder on ${msgDate}`