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diff --git a/static/strftime.js b/static/strftime.js
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+/* Port of strftime() by T. H. Doan (https://thdoan.github.io/strftime/)
+ *
+ * Day of year (%j) code based on Joe Orost's answer:
+ * http://stackoverflow.com/questions/8619879/javascript-calculate-the-day-of-the-year-1-366
+ *
+ * Week number (%V) code based on Taco van den Broek's prototype:
+ * http://techblog.procurios.nl/k/news/view/33796/14863/calculate-iso-8601-week-and-year-in-javascript.html
+ */
+function strftime(sFormat, date) {
+  if (typeof sFormat !== 'string') {
+    return '';
+  }
+
+  if (!(date instanceof Date)) {
+    date = new Date();
+  }
+
+  const nDay = date.getDay();
+  const nDate = date.getDate();
+  const nMonth = date.getMonth();
+  const nYear = date.getFullYear();
+  const nHour = date.getHours();
+  const nTime = date.getTime();
+  const aDays = [
+    'Sunday',
+    'Monday',
+    'Tuesday',
+    'Wednesday',
+    'Thursday',
+    'Friday',
+    'Saturday'
+  ];
+  const aMonths = [
+    'January',
+    'February',
+    'March',
+    'April',
+    'May',
+    'June',
+    'July',
+    'August',
+    'September',
+    'October',
+    'November',
+    'December'
+  ];
+  const aDayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
+  const isLeapYear = () => (nYear % 4 === 0 && nYear % 100 !== 0) || nYear % 400 === 0;
+  const getThursday = () => {
+    const target = new Date(date);
+    target.setDate(nDate - ((nDay + 6) % 7) + 3);
+    return target;
+  };
+  const zeroPad = (nNum, nPad) => ((Math.pow(10, nPad) + nNum) + '').slice(1);
+
+  return sFormat.replace(/%[a-z]+\b/gi, (sMatch) => {
+    return (({
+      '%a': aDays[nDay].slice(0, 3),
+      '%A': aDays[nDay],
+      '%b': aMonths[nMonth].slice(0, 3),
+      '%B': aMonths[nMonth],
+      '%c': date.toUTCString().replace(',', ''),
+      '%C': Math.floor(nYear / 100),
+      '%d': zeroPad(nDate, 2),
+      '%e': nDate,
+      '%F': (new Date(nTime - (date.getTimezoneOffset() * 60000))).toISOString().slice(0, 10),
+      '%G': getThursday().getFullYear(),
+      '%g': (getThursday().getFullYear() + '').slice(2),
+      '%H': zeroPad(nHour, 2),
+      '%I': zeroPad((nHour + 11) % 12 + 1, 2),
+      '%j': zeroPad(aDayCount[nMonth] + nDate + ((nMonth > 1 && isLeapYear()) ? 1 : 0), 3),
+      '%k': nHour,
+      '%l': (nHour + 11) % 12 + 1,
+      '%m': zeroPad(nMonth + 1, 2),
+      '%n': nMonth + 1,
+      '%M': zeroPad(date.getMinutes(), 2),
+      '%p': (nHour < 12) ? 'AM' : 'PM',
+      '%P': (nHour < 12) ? 'am' : 'pm',
+      '%s': Math.round(nTime / 1000),
+      '%S': zeroPad(date.getSeconds(), 2),
+      '%u': nDay || 7,
+      '%V': (() => {
+        const target = getThursday();
+        const n1stThu = target.valueOf();
+        target.setMonth(0, 1);
+        const nJan1 = target.getDay();
+
+        if (nJan1 !== 4) {
+          target.setMonth(0, 1 + ((4 - nJan1) + 7) % 7);
+        }
+
+        return zeroPad(1 + Math.ceil((n1stThu - target) / 604800000), 2);
+      })(),
+      '%w': nDay,
+      '%x': date.toLocaleDateString(),
+      '%X': date.toLocaleTimeString(),
+      '%y': (nYear + '').slice(2),
+      '%Y': nYear,
+      '%z': date.toTimeString().replace(/.+GMT([+-]\d+).+/, '$1'),
+      '%Z': date.toTimeString().replace(/.+\((.+?)\)$/, '$1'),
+      '%Zs': new Intl.DateTimeFormat('default', {
+        timeZoneName: 'short',
+      }).formatToParts(date).find((oPart) => oPart.type === 'timeZoneName')?.value,
+    }[sMatch] || '') + '') || sMatch;
+  });
+}