Check AI schedule conflicts: separate overlap, touching endpoints and buffers

Define interval and resource rules first

The VEVENT specification in RFC 5545 makes DTSTART inclusive and DTEND non-inclusive. This original exercise adopts that endpoint convention and counts only positive-duration intersections. Do not assume every business scheduling system applies the same rule without checking.

State which person or resource cannot be shared. Simultaneous meetings with independent attendees and rooms need not conflict under the question being asked. Here all four meetings use the same person P and room R. Recurrence, all-day items and midnight crossings are deliberately outside this initial case.

Four meetings create six unordered pairs

All records below are fictional, dated 2026-10-15, on a fixed UTC+08:00 time basis. Every end follows its start. A fixed offset for this exercise is not a permanent time-zone policy for a location. If a real source says only “nine in the morning,” use the date and offset ambiguity checks before comparing intervals.

This is a fictional audit; do not create or change calendar entries. Date 2026-10-15, fixed UTC+08:00. A 09:00–09:30; B 09:30–10:00; C 09:20–09:40; D 10:00–10:15. All share person P and room R. Start is inclusive and end exclusive. List all 6 unordered pairs. Apply max(start)<min(end), showing intersection bounds and positive overlap minutes. Equality means touching, not overlapping. Separately check a 10-minute buffer for A→B and B→D. Preserve IDs and times; do not guess missing values, reschedule or send invitations.

Establish the answer before reviewing AI output

For A and C, the later start is 09:20 and earlier end 09:30: ten minutes overlap. B and C intersect from 09:30 to 09:40, also ten minutes. For A and B both bounds are 09:30, so strict inequality fails. B and D likewise touch without positive overlap.

Four records produce 4×3÷2=6 unordered pairs. Comparing only adjacent rows can miss a meeting crossing several others. Do not count A–C and C–A twice; a stable sorted pair key such as A|C makes omissions and duplicates easier to detect.

Treat transition time as another requirement

Now check a ten-minute buffer only for the specified handoffs A→B and B→D. Each gap is zero, leaving a ten-minute shortfall. Report “no time overlap, but insufficient buffer.” This does not make the whole schedule feasible: the actual A–C and B–C overlaps still need resolution.

If the buffer depends on location, supply a rule or a known duration rather than asking AI to invent travel time. Do not silently extend meeting ends and overwrite the source table. Keeping occupied time and the buffer requirement separate makes each conclusion traceable.

Audit the pairs instead of trusting confident prose

Compare each reported pair with the answer key. Check IDs, original times, omitted pairs and whether zero became “unknown.” Pay particular attention to a method that checks only neighboring rows after sorting and therefore overlooks C’s effect on both A and B.

Keep stable IDs when titles change. The stable-ID list reconciliation workflow explains a related identity check; identical meeting names are not a reason to delete a record. Retain input, rules, returned output and unresolved questions for later recalculation.

Preserve unknowns when the source is incomplete

Real schedules may contain cancelled entries, transparent events, recurrence exceptions, several time zones and overnight intervals. Decide which records actually occupy the constrained resource before extending this example. A missing end time cannot support this calculation without an explicit rule.

Programs and spreadsheets can perform interval calculations too. AI can help explain exceptions and organize clarification requests, but its prose does not establish that a calendar was changed. Return to the source schedule and authorized calendar workflow before taking action.