BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//astro/ticker//NONSGML v1.0//DE
METHOD:PUBLISH
X-WR-TIMEZONE;VALUE=TEXT:Europe/Berlin

{% for e in events -%}
BEGIN:VEVENT
SUMMARY:{{ e.summary }}
DTSTAMP:{{ e.dtstart.format("%Y%m%dT%H%M%S").to_string() }}
DTSTART:{{ e.dtstart.format("%Y%m%dT%H%M%S").to_string() }}
{% if let Some(dtend) = e.dtend -%}
DTEND:{{ dtend.format("%Y%m%dT%H%M%S") }}
{% endif -%}
UID:{{ e.id.replace(char::is_whitespace, "_") }}
{% if let Some(url) = e.url -%}
URL:{{ url }}
{% endif -%}
{% if let Some(location) = e.location -%}
LOCATION:{{ location }}
{% endif -%}
END:VEVENT

{% endfor -%}
END:VCALENDAR