regex - Calculate Date/Days using vscode snippets

Question

I'm trying to add to a VSCode snippet the day of lockdown we are currently on (when the snippet is run).

My current snippet is:

    "New Day Blog Entry Separator": {
    "scope": "html, HTML",
    "prefix": [
        "dtn",
        "ndbe"
    ],
    "body": [
        "<div id=$CURRENT_YEAR$CURRENT_MONTH$CURRENT_DATE$CURRENT_HOUR$CURRENT_MINUTE>",
        "<hr>",
        "<p style="color: cadetblue;">$CURRENT_DAY_NAME $CURRENT_DATE $CURRENT_MONTH_NAME $CURRENT_YEAR<br>",
        "$CURRENT_HOUR:$CURRENT_MINUTE<br>",
        "<abbr title="The UNIX Epoch occurred at 00:00 on 1st January 1970.">Epoch</abbr> Seconds: $CURRENT_SECONDS_UNIX</p>",
        "<hr>",
        "<h1>${2:Heading}</h1>",
        "<p>${3:Body}</p>",
        "</div>",
        "<hr>"
    ],
    "description": "Add a blog entry separator"

and gives the output:

<div id=202101051548>
        <hr>
        <p style="color: cadetblue;">Tuesday 05 January 2021<br>
          15:48<br>
          <abbr title="The UNIX Epoch occurred at 00:00 on 1st January 1970.">Epoch</abbr> Seconds: 1609861711
        </p>
        <hr>
          <h1>Heading</h1>
          <p>Body</p>
      </div>
      <hr>

I want it to give an intial Heading of "Day x of Lockdown 3.0". i.e.:

<div id=202101051548>
        <hr>
        <p style="color: cadetblue;">Tuesday 05 January 2021<br>
          15:48<br>
          <abbr title="The UNIX Epoch occurred at 00:00 on 1st January 1970.">Epoch</abbr> Seconds: 1609861711
        </p>
        <hr>
          <h1>Day X of Lockdown 3.0</h1>
          <h1>Heading</h1>
          <p>Body</p>
      </div>
      <hr>

The $CURRENT_DATE variable only returns the 2-digit date, rather than a full yyyymmdd string.

I think there must be a regex transformation on a variable that can do this, but I'm at a bit of a loss as to where to start. I've seen that VS Code snippets use TextMate, and looking at the TM Manual on Dynamic Variables, there doesn't appear to be a good starting point. I suppose I could work out the UNIX epoch seconds between now and the reference date? But how do I then get that into a date format?

Answer 1

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