Initial Commit

src/time.js

@@ -0,0 +1,49 @@
+export const timeRe = /^(?:[012]?\d:\d{2}|1?\d(?::\d{2})?(?:am|pm))$/i
+
+export function convertTime(value) {
+    if (/^[012]?\d:\d{2}$/.test(value)) {
+        return value;
+    }
+    const twelveHour = /^(?<hour>[01]?\d)(?::(?<min>\d{2}))?(?<ampm>am|pm)$/i.exec(value);
+    if (twelveHour != null) {
+        let hour = parseInt(twelveHour.groups['hour'], 10);
+        const minute = parseInt(twelveHour.groups['min'] ?? '0', 10);
+        const ampm = twelveHour.groups['ampm'].toLowerCase();
+        if (hour === 12) {
+            if (ampm === 'am') {
+                hour = 0;
+            }
+        } else if (ampm === 'pm') {
+            if (hour < 12) {
+                hour += 12;
+            }
+        }
+        return `${hour.toString().padStart(2, '0')}:${minute.toString().padStart(2, '0')}`;
+    }
+
+    return value;
+}
+
+export function timeToMins(value) {
+    const match = /^(?<hour>[012]?\d):(?<min>\d{2})$/.exec(value);
+    if (match) {
+        const hour = parseInt(match.groups.hour, 10);
+        const min = parseInt(match.groups.min, 10);
+        return (hour * 60) + min;
+    }
+    return 0;
+}
+
+export function minsToTime(totalMinutes) {
+    let prefix = totalMinutes < 0 ? '- ' : '';
+    let absMinutes = Math.abs(totalMinutes);
+    let hours = Math.floor(absMinutes / 60);
+    let minutes = absMinutes % 60;
+    if (minutes > 0) {
+        return `${prefix}${hours}h ${minutes}m`;
+    }
+    if (hours > 0) {
+        return `${hours}h`;
+    }
+    return '0m';
+}