A Timespan object defines a contiguous or non-contiguous period of time. It is used to specify when a Regulation applies. It supports variety of different concepts for expressing time which may be combined together.

Some of the concepts supported by Timespan:

Type	Description	Example(s)
time of day	A span of time during a day	between 7am and 9:30am
day of week	Specific days of the week	Monday or Weekdays
day of month	Specific days each month	15th day of month or last day of the month or odd numbered days
selected day of week	Certain days of the week within each month	1st and 3rd Friday of the month or odd-numbered Thursdays
fixed date ranges	Specific date ranges	August 2nd, 2018 through August 5th, 2018
annual date ranges	Date ranges that apply every year	April 1st through November 30th
designated periods	Externally-defined named designations for time periods	Holidays or Game Days or Snow Emergencies

Definition

field name	format	description	example
effective_dates	object or array	Specific date range (or multiple date ranges) that define a fixed span of time or an annual period
effective_dates.from	string (MMDD or YYYYMMDD)	The beginning date of a time period. This is either a full date or a month and day that will define the timespan on an annual basis	20180802 or 0401
effective_dates.until	string (MMDD or YYYYMMDD)	The ending date of a time period. This is either a full date or a month and day that will define the timespan on an annual basis	20180805 or 1130
days_of_week	object	Determines which days of the week will be included in a timespan.
days_of_week.days	enum (values: Mo Tu We Th Fr Sa Su)	List of days to include in the timespan	To specify weekdays: ["Mo", "Tu", "We", "Th", "Fr"]
days_of_week.occurrence_in_month	enum (values: 1st 2nd 3rd 4th 5th last)	Modifier to indicate which occurrences of the specified days within the month to include in the timespan	["1st", "3rd"]
days_of_month	enum (values: 1-31, last, odd, even)	Specify specific days during the month to include in the timespan	To specify the 14th and last day of the month ["14", "last"]
time_of_day	object or array	Specific time range during the day (or multiple time ranges)
time_of_day.from	string (HHMM)	The beginning time (24H) of the time range	0700
time_of_day.until	string (HHMM)	The ending time (24H) of the time range	0930
designated_period	object	An arbitrary, externally-defined named period of time. Timespan can be defined to only apply during a designated period or at all times except during a designated period.
designated_period.name	string	The name of designated period.	Snow Emergency or Holidays
designated_period.apply	string (only_during or except_during)	Will the designated period be excluded from the timespan or will the timespan only apply during the period.	Except Holidays: except_during or During Snow Emergency: only_during

When multiple "clauses" are combined in a single Timespan, a logical AND operation is applied. For example, a Timespan that includes Wednesdays and the period of February 1st through April 30th specifies all Wednesdays between February 1st and April 30th. It does not specify all Wednesdays during the year AND all days between February 1st and April 30th (the equivalent of a logical OR operation).

Examples

No Stopping at fire hydrant

Timespan applies at all times:

{
}

No overnight parking

Timespan applies overnight (midnight until 6am).

{
  time_of_day: {
    from: "0000",
    until: "0600"
  }
}

Rush hour (AM and PM) parking restriction

Timespan applies during the morning and evening rush hours.

{
  time_of_day: [
      {from: "0730",
       until: "0930"},
      {from: "1600",
       until: "1800"}
    ]
}

No parking during snow emergency

Timespan in effect only during a snow emergency

{
  designated_period: {
    name: "Snow Emergency"
    apply: "only_during"
  }
}

Meters in effect

Timespan applies Monday through Saturday between 8am and 8pm, except holidays.

{
  days_of_week: {
    days: ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa']
  },
  time_of_day: {
    from: "0800",
    until: "2000"
  },
  designated_period {
    name: "Holidays"
    apply: "except_during"
  }
}

Temporary construction permit

Timespan applies during designated construction hours (7am until 7pm) for the days during which the permit is valid (August 2nd, 2018 through August 5th, 2018)

{
  time_of_day: {
    from: "0700",
    until: "1900"
  },
  effective_dates: {
    from: "20180802",
    until: "20180805"
  }
}

Alternate side parking for overnight snow removal

Timespan applies on odd number days between December 1st and March 31st from 1am until 6am.

{
  days_of_month: ['odd'],
  time_of_day: {
    from: "0100",
    until: "0600"
  },
  effective_dates: {
    from: "1201",
    until: "0331"
  }
}

Bi-weekly street cleaning

Timespan applies between 11am and 1pm on the 2nd and 4th Tuesday of every month between April 1st and November 30th each year.

{
  days_of_week: {
    days: ['Tu'],
    occurrence_in_month: ['2nd', '4th']
  },
  time_of_day: {
    from: "1100",
    until: "1300"
  },
  effective_dates: {
    from: "0401",
    until: "1130"
  }
}