For you guys you'd probably go with:
Code
/* PHP CODE HERE */
if(date("U") <= mktime(0, 0, 0, 4, 4, 2014) /* hour, minute, second, month, day, year */) {
// Spring
$blurb = "until our next Swap Meet";
$color = "FF0000";
$date = "April 04, 2014";
} else {
$blurb = "";
$color = "";
$date = "";
}

/* BODY HERE */
$body = <<<EOF
<script language="JavaScript" type="text/javascript">
today = new Date();
BigDay = new Date("$date");
msPerDay = 24 * 60 * 60 * 1000;
timeLeft = (BigDay.getTime() - today.getTime());
e_daysLeft = timeLeft / msPerDay;
daysLeft = Math.floor(e_daysLeft);
e_hrsLeft = (e_daysLeft - daysLeft)*24;
hrsLeft = Math.floor(e_hrsLeft);
minsLeft = Math.floor((e_hrsLeft - hrsLeft)*60);
document.write("<span style=\"color: #$color; font-family:'Comic Sans MS';\">Only " + daysLeft + " days " + hrsLeft +" hours and " + minsLeft + " minutes $blurb!</span>");
</script>
EOF;

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