如何使用ICS文件删除重复事件系列中的指定后续事件？

我想实现类似Google或Zoom的「删除此事件及后续所有实例」功能，但尝试后无法将这些事件全部删除。当前使用的RECURRENCE-ID参数如下：
RECURRENCE-ID;RANGE=THISANDFUTURE;TZID=America/New_York:20230221T100000Z

我看到有人推荐在RECURRENCE-ID的RANGE参数中使用UNTIL，但找不到对应的语法或可用示例。

创建重复事件的完整ICS代码 #

BEGIN:VCALENDAR
VERSION:2.0
PRODID://Events//iCal 2.1//EN
METHOD:REQUEST
X-WR-CALNAME:Event Calendar
X-WR-TIMEZONE:America/New_York
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:America/New_York
TZURL:http://tzurl.org/zoneinfo-outlook/America/New_York
X-LIC-LOCATION:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:19700308T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:19701101T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
TRANSP:OPAQUE
CREATED:20221221T094254Z
UID:TESTSC20221221094254
DTEND;TZID=America/New_York:20221226T110000
SUMMARY:deadline approaching Event
LOCATION;ENCODING=QUOTED-PRINTABLE:Virtual Meeting
DTSTART;TZID=America/New_York:20221226T100000
DTSTAMP:20221221T094254Z
ORGANIZER;CN=Events:mailto:events@abc.org
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=abc@abc.org;X-NUM-GUESTS=0:mailto:abc@abc.org
STATUS:CONFIRMED
DESCRIPTION:A. Want to join the meeting from your computer, tablet or smartphone?\n go to https://zoom.us/
SEQUENCE:0
RRULE:FREQ=DAILY;INTERVAL=1;UNTIL=20230228T110000Z
BEGIN:VALARM
DESCRIPTION:REMINDER
TRIGGER;RELATED=START:-PT10M
ACTION:DISPLAY
END:VALARM
END:VEVENT
END:VCALENDAR

当前用于删除操作的完整ICS代码 #

VERSION:2.0
PRODID://Events//iCal 2.1//EN
METHOD:CANCEL
X-WR-CALNAME:Event Calendar
X-WR-TIMEZONE:America/New_York
CALSCALE:GREGORIAN
BEGIN:VEVENT
TRANSP:OPAQUE
CREATED:20221221T145554Z
UID:TESTSC20221221094254
DTSTART;TZID=America/New_York:20221226T100000
DTEND;TZID=America/New_York:20221226T110000
SUMMARY:Event: deadline approaching Cancelled
LOCATION;ENCODING=QUOTED-PRINTABLE:Virtual Meeting
DTSTAMP:20221221T145554Z
ORGANIZER;CN=Events:mailto:events@abc.org
RECURRENCE-ID;RANGE=THISANDFUTURE;TZID=America/New_York:20230221T100000Z
SEQUENCE:0
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=abc@abc.org;X-NUM-GUESTS=0:mailto:abc@abc.org
STATUS:CANCELLED
DESCRIPTION:This meeting has been deleted. Please contact HQ for scheduling a new meeting or more information about this.
END:VEVENT
END:VCALENDAR

解决方案及修正说明 #

关键问题点 #

1. SEQUENCE值未递增：原始事件的SEQUENCE为0，删除请求的SEQUENCE必须设为1（或更高），否则日历客户端会认为这是旧版本请求，直接忽略。
2. RECURRENCE-ID时间格式冲突：同时指定TZID=America/New_York和UTC时间后缀Z会导致时间解析错误，二者只能二选一。
3. 缺少VCALENDAR起始标签：当前删除代码的ICS缺少BEGIN:VCALENDAR起始标记，不符合iCal标准规范。

修正后的删除操作ICS代码 #

BEGIN:VCALENDAR
VERSION:2.0
PRODID://Events//iCal 2.1//EN
METHOD:CANCEL
X-WR-CALNAME:Event Calendar
X-WR-TIMEZONE:America/New_York
CALSCALE:GREGORIAN
BEGIN:VEVENT
TRANSP:OPAQUE
CREATED:20221221T145554Z
UID:TESTSC20221221094254
DTSTART;TZID=America/New_York:20221226T100000
DTEND;TZID=America/New_York:20221226T110000
SUMMARY:Event: deadline approaching Cancelled
LOCATION;ENCODING=QUOTED-PRINTABLE:Virtual Meeting
DTSTAMP:20221221T145554Z
ORGANIZER;CN=Events:mailto:events@abc.org
RECURRENCE-ID;RANGE=THISANDFUTURE;TZID=America/New_York:20230221T100000
SEQUENCE:1
ATTENDEE;CUTYPE=INDIVIDUAL;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=abc@abc.org;X-NUM-GUESTS=0:mailto:abc@abc.org
STATUS:CANCELLED
DESCRIPTION:This meeting has been deleted. Please contact HQ for scheduling a new meeting or more information about this.
END:VEVENT
END:VCALENDAR

补充说明 #

• iCal标准中并没有RANGE=UNTIL的语法，RANGE=THISANDFUTURE就是实现「删除此实例及后续所有重复事件」的正确参数。
• 确保删除请求的UID与原始事件完全一致，这是关联重复事件的核心标识。
• RECURRENCE-ID的两种正确写法：
  • 指定时区+本地时间：RECURRENCE-ID;RANGE=THISANDFUTURE;TZID=America/New_York:20230221T100000
  • UTC时间（无需时区参数）：RECURRENCE-ID;RANGE=THISANDFUTURE:20230221T150000Z（对应纽约时间10点，EST时区UTC-5）

内容的提问来源于stack exchange，提问作者Rohan Tapiyawala