Perfect Clock

Plans a one-off or recurring meeting with people in other time zones when its time is known (e.g. "every other Tuesday at 10:00 Berlin time with Anna in Tbilisi"). Expands it into concrete dates and shows each one in every participant's local time, with working-hours checks, public holidays and daylight-saving shifts. Saves the schedule for 30 days and returns a private perfectclock.cc/s/... link that opens it in Perfect Clock.

{
  "type": "object",
  "properties": {
    "title": {
      "type": "string",
      "maxLength": 120,
      "description": "Meeting title."
    },
    "tz": {
      "type": "string",
      "description": "Time zone the meeting time is fixed in (usually the organizer's)."
    },
    "time": {
      "type": "string",
      "pattern": "^([01]\\d|2[0-3]):[0-5]\\d$",
      "description": "Local start time in `tz`."
    },
    "durationMinutes": {
      "default": 60,
      "type": "integer",
      "minimum": 5,
      "maximum": 720
    },
    "rule": {
      "type": "object",
      "properties": {
        "freq": {
          "type": "string",
          "enum": [
            "once",
            "daily",
            "weekly",
            "monthly"
          ]
        },
        "interval": {
          "description": "Every N days/weeks/months; default 1.",
          "type": "integer",
          "minimum": 1,
          "maximum": 12
        },
        "byDay": {
          "description": "Weekdays for weekly rules; for monthly with setPos, the weekday.",
          "type": "array",
          "items": {
            "type": "string",
            "enum": [
              "MO",
              "TU",
              "WE",
              "TH",
              "FR",
              "SA",
              "SU"
            ]
          }
        },
        "setPos": {
          "description": "Monthly \"Nth weekday\": 1-4, or -1 for the last.",
          "type": "integer",
          "minimum": -1,
          "maximum": 4
        },
        "start": {
          "description": "First possible date in `tz`; default today.",
          "type": "string",
          "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
        },
        "count": {
          "type": "integer",
          "minimum": 1,
          "maximum": 500
        },
        "until": {
          "type": "string",
          "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
        }
      },
      "required": [
        "freq"
      ],
      "description": "Recurrence of the meeting."
    },
    "participants": {
      "minItems": 1,
      "maxItems": 10,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string",
            "maxLength": 60,
            "description": "How the participant or place is called in the conversation, e.g. \"Anna\" or \"Tokyo office\"."
          },
          "tz": {
            "type": "string",
            "description": "IANA time zone of this participant, e.g. Asia/Tbilisi."
          },
          "workHours": {
            "description": "Local working hours [start, end]; default [\"09:00\",\"17:00\"].",
            "minItems": 2,
            "maxItems": 2,
            "type": "array",
            "items": {
              "type": "string",
              "pattern": "^([01]\\d|2[0-3]):[0-5]\\d$"
            }
          }
        },
        "required": [
          "label",
          "tz"
        ]
      },
      "description": "People or places the meeting must suit, each with their own time zone."
    },
    "maxOccurrences": {
      "default": 8,
      "description": "How many upcoming meetings to list.",
      "type": "integer",
      "minimum": 1,
      "maximum": 20
    }
  },
  "required": [
    "title",
    "tz",
    "time",
    "rule",
    "participants"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Finds when people in other time zones can meet, when the time is not decided yet: the windows on each day when all participants are within their working hours, accounting for weekends, public holidays and daylight-saving changes, and one suggested start time that fits the most days. Saves that suggested time on those days for 30 days and returns a private perfectclock.cc/s/... link that opens it in Perfect Clock.

{
  "type": "object",
  "properties": {
    "title": {
      "description": "Meeting title, if the user gave one.",
      "type": "string",
      "maxLength": 120
    },
    "tz": {
      "type": "string",
      "description": "Time zone whose calendar days are scanned (usually the organizer's)."
    },
    "from": {
      "description": "First day in `tz`; default today.",
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
    },
    "days": {
      "default": 5,
      "type": "integer",
      "minimum": 1,
      "maximum": 14
    },
    "durationMinutes": {
      "default": 60,
      "type": "integer",
      "minimum": 15,
      "maximum": 480
    },
    "participants": {
      "minItems": 1,
      "maxItems": 10,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string",
            "maxLength": 60,
            "description": "How the participant or place is called in the conversation, e.g. \"Anna\" or \"Tokyo office\"."
          },
          "tz": {
            "type": "string",
            "description": "IANA time zone of this participant, e.g. Asia/Tbilisi."
          },
          "workHours": {
            "description": "Local working hours [start, end]; default [\"09:00\",\"17:00\"].",
            "minItems": 2,
            "maxItems": 2,
            "type": "array",
            "items": {
              "type": "string",
              "pattern": "^([01]\\d|2[0-3]):[0-5]\\d$"
            }
          }
        },
        "required": [
          "label",
          "tz"
        ]
      },
      "description": "People or places the meeting must suit, each with their own time zone."
    }
  },
  "required": [
    "tz",
    "participants"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}