fertiges design.

src/utils/calendar.js

@@ -0,0 +1,41 @@
+
+export function googleCalendarUrl({ title, details, location, start, end }){
+  const params = new URLSearchParams({
+    action: 'TEMPLATE',
+    text: title,
+    details,
+    location,
+    dates: `${formatDate(start)}/${formatDate(end)}`
+  })
+  return `https://calendar.google.com/calendar/render?${params.toString()}`
+}
+
+export function downloadICS({ title, details, location, start, end, filename='event.ics' }){
+  const ics = [
+    'BEGIN:VCALENDAR',
+    'VERSION:2.0',
+    'PRODID:-//Annaville SDA Church//EN',
+    'CALSCALE:GREGORIAN',
+    'BEGIN:VEVENT',
+    `DTSTART:${formatDate(start)}`,
+    `DTEND:${formatDate(end)}`,
+    `SUMMARY:${escapeICS(title)}`,
+    `DESCRIPTION:${escapeICS(details || '')}`,
+    `LOCATION:${escapeICS(location || '')}`,
+    'END:VEVENT',
+    'END:VCALENDAR'
+  ].join('\r\n')
+  const blob = new Blob([ics], { type: 'text/calendar' })
+  const url = URL.createObjectURL(blob)
+  const a = document.createElement('a')
+  a.href = url; a.download = filename; a.click()
+  URL.revokeObjectURL(url)
+}
+
+function formatDate(date){
+  const pad = n => String(n).padStart(2, '0')
+  return `${date.getUTCFullYear()}${pad(date.getUTCMonth()+1)}${pad(date.getUTCDate())}T${pad(date.getUTCHours())}${pad(date.getUTCMinutes())}00Z`
+}
+function escapeICS(text){
+  return text.replace(/,/g, '\\,').replace(/;/g, '\\;').replace(/\n/g, '\\n')
+}