BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
DTSTART:20000101T000000
DURATION:P1DT0H0M0S
SUMMARY:One day
END:VEVENT
BEGIN:VEVENT
DTSTART:20000101T000000
DURATION:P1DT1H1M1S
SUMMARY:One day, one hour, one minute and one second
END:VEVENT
BEGIN:VEVENT
DTSTART:20000101T000000
DURATION:PT1H1M1S
SUMMARY:One hour, one minute and one second
END:VEVENT
BEGIN:VEVENT
DTSTART:20000101T000000
DURATION:PT1M1S
SUMMARY:One minute and one second
END:VEVENT
BEGIN:VEVENT
DTSTART:20000101T000000
DURATION:PT1S
SUMMARY:One second
END:VEVENT
END:VCALENDAR