Family screen-time timetable calculator

Calculate timetable [request,person,device,start,end] and unscheduled request IDs with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use timetable [request,person,device,start,end] and unscheduled request IDs to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Requests JSON [ID,person ID,desired minutes,agreed allowance minutes]
[["R1","A",30,45],["R2","B",30,30]]
Device windows JSON [device ID,start minute,end minute]
[["tablet",960,1020]]
Fixed commitments JSON [person ID,start minute,end minute]
[["A",960,975]]
Timetable [request,person,device,start,end]
[["R1","A","tablet",975,1005]]
Unscheduled request IDs
["R2"]
Scheduled device minutes
30

Try another scenario

Requests JSON [ID,person ID,desired minutes,agreed allowance minutes]
[["R1","A",30,45],["R2","B",30,30]]
Device windows JSON [device ID,start minute,end minute]
[["tablet",960,1050]]
Fixed commitments JSON [person ID,start minute,end minute]
[["A",960,975]]
Timetable [request,person,device,start,end]
[["R1","A","tablet",975,1005],["R2","B","tablet",1005,1035]]
Unscheduled request IDs
[]
Scheduled device minutes
60
Calculation method

Calculation method

Timetable [request,person,device,start,end]

Process requests in user priority order. Reject request above its explicit allowance. Scan integer-minute start options within supplied device windows; choose earliest start then device ID, avoiding person/device conflicts and fixed commitments.

Unscheduled request IDs

Requests exceeding allowance or not fitting available slots under greedy proposal.

Scheduled device minutes

Sum scheduled session durations.

Symbols and units
a
Requests JSON [ID,person ID,desired minutes,agreed allowance minutes]
b
Device windows JSON [device ID,start minute,end minute]
c
Fixed commitments JSON [person ID,start minute,end minute]

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • One indivisible request per person in this bounded version. Allowances and order are family-supplied rules; no health or age recommendations. Greedy schedule, no optimality claim. Supported limits: 1..30 requests, distinct people; minute durations/allowances integer>0; 1..20 device windows, 0<=start<end<=1440; same-device windows may not overlap.
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