add timezone converter

sccn · May 14, 2021 · d535dfe · d535dfe
1 parent 849815d
commit d535dfe
Show file tree

Hide file tree

Showing 5 changed files with 129 additions and 66 deletions.
diff --git a/_includes/head.html b/_includes/head.html
@@ -34,4 +34,5 @@
   {% seo %}
 
   {% include head_custom.html %}
+
 </head>
diff --git a/_includes/head_custom.html b/_includes/head_custom.html
@@ -0,0 +1,60 @@
+<script>
+        function changeTimezone(toTimezone) {
+            var elems = document.getElementsByClassName("time");
+            for (let i = 0; i < elems.length; i++) {
+                const elem = elems[i];
+                let fromTimezone = elem.dataset.timezone;
+                if (fromTimezone === undefined) {
+                    fromTimezone = 'PDT';
+                }
+                if (fromTimezone !== toTimezone) {
+                    const timeText = elem.innerHTML;
+                    const [validFromTimezone, utcOffset] = getValidTimezone(fromTimezone);
+                    const dateTimeString = "2020-04-13T" + reformatTimeString(timeText) + utcOffset;
+                    const [validToTimezone,offset] = getValidTimezone(toTimezone);
+                    const converted = new Date(dateTimeString).toLocaleString("en-US", {timeZone: validToTimezone});
+                    const newTimeArray = converted.split(" ")[1].split(":");
+                    const newTime = newTimeArray[0] + ":" + newTimeArray[1] + converted.split(" ")[2];
+                    elem.innerHTML = newTime;
+                    elem.dataset.timezone = toTimezone;
+                }
+            }
+        }
+        function reformatTimeString(timeString) {
+            const re = /(\d?\d:\d\d)(am|pm|AM|PM)?/;
+            const parsed = timeString.match(re);
+            if (parsed) {
+                const hourMinArray = parsed[1].split(":");
+                let hour = parseInt(hourMinArray[0]);
+                if (parsed[2]) {
+                    if (parsed[2].toLowerCase() === "pm") {
+                        if (hour !== 12)
+                            hour += 12;
+                    }
+                }
+                const hourString = hour.toString().padStart(2, '0');
+                return hourString + ":" + hourMinArray[1];
+            }
+            else
+                return null
+        }
+        function getValidTimezone(timezone) {
+            let validTimezone = "";
+            let offset = "";
+            switch (timezone) {
+                case 'PDT':
+                    validTimezone = "America/Los_Angeles";
+                    offset = "-07:00";
+                    break;
+                case 'EDT':
+                    validTimezone = "America/New_York";
+                    offset = "-04:00";
+                    break;
+                case 'CEST':
+                    validTimezone = "Europe/Amsterdam";
+                    offset = "+02:00";
+                    break;
+            }
+            return [validTimezone, offset];
+        }
+</script>
diff --git a/_includes/timezone.html b/_includes/timezone.html
@@ -0,0 +1 @@
+<span>1:00am</span>
diff --git a/_layouts/default.html b/_layouts/default.html
@@ -6,9 +6,6 @@
 
 <html lang="{{ site.lang | default: 'en-US' }}">
 {% include head.html %}
-<script>
-console.log("Using modified default.html");
-</script>
 <body>
   <svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
     <symbol id="svg-link" viewBox="0 0 24 24">
Original file line number	Diff line number	Diff line change
Expand Up		@@ -34,4 +34,5 @@
		{% seo %}

		{% include head_custom.html %}

		</head>