ShiftSharp

The ShiftSharp library project manages work schedules. A work schedule consists of one or more teams who rotate through a sequence of shift and off-shift periods of time. The ShiftSharp project allows breaks during shifts to be defined as well as non-working periods of time (e.g. holidays and scheduled maintenance periods) that are applicable to the entire work schedule. The C# project is a port of the java project at https://github.com/point85/Shift.

Concepts

The diagram below illustrates Business Management Systems' DNO (Day, Night, Off) work schedule with three teams and two 12-hour shifts with a 3-day rotation. This schedule is explained in http://community.bmscentral.com/learnss/ZC/3T/c3tr12-1.

Shift

A shift is defined with a name, description, starting time of day and duration. An off-shift period is associated with a shift. In the example above for Team1, there are two shifts followed by one off-shift period. Shifts can be overlapped (typically when a handoff of duties is important such as in the nursing profession). A rotation is a sequence of shifts and off-shift days. The DNO rotation is Day on, Night on and Night off. An instance of a shift has a starting date and time of day and has an associated shift definition.

Break

A break is a defined working period of time during a shift, for example lunch. A shift can have zero or more breaks.

Team

A team is defined with a name and description. It has a rotation with a starting date. The starting date shift will have an instance with that date and a starting time of day as defined by the shift. The same rotation can be shared between more than one team, but with different starting times.

Team Member

A team member is a person assigned to a team. The member is identified by a member ID (e.g. employee ID), name and description/title.

Team Member Exception

A team member exception is an addition and/or removal from the assigned members of a team for a specified shift instance. The instance is identified by the starting date and time.

Work Schedule

A work schedule is defined with a name and description. It has one or more teams. Zero or more non-working periods can be defined. A non-working period has a defined starting date and time of day and duration. For example, the New Year's Day holiday starting at midnight for 24 hours, or three consecutive days for preventive maintenance of manufacturing equipment starting at the end of the night shift.

After a work schedule is defined, the working time for all shifts can be computed for a defined time interval. For example, this duration of time is the maximum available productive time as an input to the calculation of the utilization of equipment in a metric known as the Overall Equipment Effectiveness (OEE).

Rotation

A rotation is a sequence of working periods (segments). Each segment starts with a shift and specifies the number of days on-shift and off-shift. A work schedule can have more than one rotation.

Non-Working Period

A non-working period is a duration of time where no teams are working. For example, a holiday or a period of time when a plant is shutdown for preventative maintenance. A non-working period starts at a defined day and time of day and continues for the specified duration of time.

Shift Instance

A shift instance is the duration of time from a specified date and time of day and continues for the duration of the associated shift. A team works this shift instance.

Examples

The DNO schedule discussed above is defined as follows.

Stringdescription="This is a fast rotation plan that uses 3 teams and two 12-hr shifts to provide 24/7 coverage. "+"Each team rotates through the following sequence every three days: 1 day shift, 1 night shift, and 1 day off.";WorkScheduleschedule=newWorkSchedule("DNO Plan",description);// Day shift, starts at 07:00 for 12 hoursShiftday=schedule.CreateShift("Day","Day shift",newLocalTime(7,0,0),Duration.FromHours(12));// Night shift, starts at 19:00 for 12 hoursShiftnight=schedule.CreateShift("Night","Night shift",newLocalTime(19,0,0),Duration.FromHours(12));// rotationRotationrotation=newRotation("DNO","DNO");rotation.AddSegment(day,1,0);rotation.AddSegment(night,1,1);schedule.CreateTeam("Team 1","First team",rotation,referenceDate);schedule.CreateTeam("Team 2","Second team",rotation,referenceDate.Minus(Period.FromDays(1)));schedule.CreateTeam("Team 3","Third team",rotation,referenceDate.Minus(Period.FromDays(2)));

To obtain the working time over three days starting at 07:00, the following methods are called:

LocalDateTimefrom=referenceDate.At(newLocalTime(7,0,0));Durationduration=schedule.CalculateWorkingTime(from,from.PlusDays(3));

To obtain the shift instances for a date, the following method is called:

List<ShiftInstance>instances=schedule.GetShiftInstancesForDay(newLocalDate(2017,3,1));

To print a work schedule, call the ToString() method. For example:

Schedule:DNOPlan(Thisis a fast rotation plan that uses 3 teams and two 12-hr shifts to provide 24/7 coverage. Each team rotates through the following sequence every three days:1 day shift,1nightshift,and1day off.)
Rotation duration: PT216H,Scheduledworking time: PT72H
Shifts:(1)Day(Dayshift),Start:07:00(PT12H),End:19:00(2)Night(Nightshift),Start:19:00(PT12H),End:07:00Teams:(1) Team 1(Firstteam), Rotation start:2016-10-31, Rotation periods:[Day(on),Night(on),(off)], Rotation duration: PT72H, Days in rotation:3, Scheduled working time: PT24H, Percentage worked:33.33%,Averagehours worked per week: PT56H
(2) Team 2(Secondteam),Rotation start:2016-10-30, Rotation periods:[Day(on),Night(on),(off)], Rotation duration: PT72H, Days in rotation:3, Scheduled working time: PT24H, Percentage worked:33.33%,Averagehours worked per week: PT56H
(3) Team 3(Thirdteam),Rotation start:2016-10-29, Rotation periods:[Day(on),Night(on),(off)], Rotation duration: PT72H, Days in rotation:3, Scheduled working time: PT24H, Percentage worked:33.33%,Average hours worked per week: PT56H
Total team coverage:100%

To print shift instances between two dates, the following method is called:

schedule.PrintShiftInstances(newLocalDate(2016,10,31),newLocalDate(2016,11,3));

with output:

Workingshifts[1]Day:2016-10-31(1) Team: Team 1, Shift: Day, Start :2016-10-31T07:00, End :2016-10-31T19:00(2) Team: Team 2,Shift:Night,Start:2016-10-31T19:00, End :2016-11-01T07:00[2] Day:2016-11-01(1) Team: Team 3, Shift: Day, Start :2016-11-01T07:00, End :2016-11-01T19:00(2) Team: Team 1,Shift:Night,Start:2016-11-01T19:00, End :2016-11-02T07:00[3] Day:2016-11-02(1) Team: Team 2, Shift: Day, Start :2016-11-02T07:00, End :2016-11-02T19:00(2) Team: Team 3,Shift:Night,Start:2016-11-02T19:00, End :2016-11-03T07:00[4] Day:2016-11-03(1) Team: Team 1, Shift: Day, Start :2016-11-03T07:00, End :2016-11-03T19:00(2) Team: Team 2,Shift:Night,Start:2016-11-03T19:00, End :2016-11-04T07:00

For a second example, the 24/7 schedule below has two rotations for four teams in two shifts. It is used by manufacturing companies.

WorkScheduleschedule=newWorkSchedule("Manufacturing Company - four twelves","Four 12 hour alternating day/night shifts");// day shift, start at 07:00 for 12 hoursShiftday=schedule.CreateShift("Day","Day shift",newLocalTime(7,0,0),Duration.FromHours(12));// night shift, start at 19:00 for 12 hoursShiftnight=schedule.CreateShift("Night","Night shift",newLocalTime(19,0,0),Duration.FromHours(12));// 7 days ON, 7 OFFRotationdayRotation=newRotation("Day","Day");dayRotation.AddSegment(day,7,7);// 7 nights ON, 7 OFFRotationnightRotation=newRotation("Night","Night");nightRotation.AddSegment(night,7,7);schedule.CreateTeam("A","A day shift",dayRotation,newLocalDate(2014,1,2));schedule.CreateTeam("B","B night shift",nightRotation,newLocalDate(2014,1,2));schedule.CreateTeam("C","C day shift",dayRotation,newLocalDate(2014,1,9));schedule.CreateTeam("D","D night shift",nightRotation,newLocalDate(2014,1,9));

When printed out for a week of shift instances, the output is:

Schedule:ManufacturingCompany-fourtwelves(Four 12 hour alternating day/night shifts)
Rotation duration: PT1344H, Scheduled working time: PT336H
Shifts:(1) Day (Dayshift),Start:07:00(PT12H),End:19:00(2) Night (Nightshift),Start:19:00(PT12H),End:07:00Teams:(1) A (Aday shift),Rotationstart:2014-01-02,Rotationperiods:[Day(on),Day(on),Day(on),Day(on),Day(on),Day(on),Day(on),(off),(off),(off),(off),(off),(off),(off)],Rotationduration: PT336H,Daysin rotation:14,Scheduledworking time: PT84H,Percentageworked:25%,Averagehours worked per week: PT42H
(2) B (B night shift),Rotation start:2014-01-02,Rotation periods:[Night(on),Night(on),Night(on),Night(on),Night(on),Night(on),Night(on),(off),(off),(off),(off),(off),(off),(off)],Rotationduration: PT336H,Daysin rotation:14,Scheduledworking time: PT84H,Percentageworked:25%,Averagehours worked per week: PT42H
(3)C(C day shift),Rotationstart:2014-01-09,Rotationperiods:[Day (on),Day(on),Day(on),Day(on),Day(on),Day(on),Day(on),(off),(off),(off),(off),(off),(off),(off)],Rotationduration: PT336H,Daysin rotation:14,Scheduledworking time: PT84H,Percentageworked:25%,Averagehours worked per week: PT42H
(4)D(D night shift),Rotationstart:2014-01-09,Rotationperiods:[Night (on),Night(on),Night(on),Night(on),Night(on),Night(on),Night(on),(off),(off),(off),(off),(off),(off),(off)],Rotationduration: PT336H,Daysin rotation:14,Scheduledworking time: PT84H,Percentageworked:25%,Averagehours worked per week: PT42H
Total team coverage:100%
Working shifts
[1] Day:2014-01-09(1)Team: C,Shift:Day,Start:2014-01-09T07:00,End:2014-01-09T19:00(2)Team: D,Shift:Night,Start:2014-01-09T19:00,End:2014-01-10T07:00[2]Day:2014-01-10(1)Team: C,Shift:Day,Start:2014-01-10T07:00,End:2014-01-10T19:00(2)Team: D,Shift:Night,Start:2014-01-10T19:00,End:2014-01-11T07:00[3]Day:2014-01-11(1)Team: C,Shift:Day,Start:2014-01-11T07:00,End:2014-01-11T19:00(2)Team: D,Shift:Night,Start:2014-01-11T19:00,End:2014-01-12T07:00[4]Day:2014-01-12(1)Team: C,Shift:Day,Start:2014-01-12T07:00,End:2014-01-12T19:00(2) Team: D,Shift:Night,Start:2014-01-12T19:00,End:2014-01-13T07:00[5]Day:2014-01-13(1) Team:C,Shift: Day,Start:2014-01-13T07:00,End:2014-01-13T19:00(2) Team: D,Shift: Night,Start:2014-01-13T19:00,End:2014-01-14T07:00[6]Day:2014-01-14(1) Team: C,Shift:Day,Start:2014-01-14T07:00,End:2014-01-14T19:00(2) Team: D,Shift:Night,Start:2014-01-14T19:00,End:2014-01-15T07:00[7]Day:2014-01-15(1) Team:C,Shift: Day,Start:2014-01-15T07:00,End:2014-01-15T19:00(2) Team: D,Shift: Night,Start:2014-01-15T19:00,End:2014-01-16T07:00

For a third example, the work schedule below with one 24 hour shift over an 18 day rotation for three platoons is used by Kern County California firefighters.

WorkScheduleschedule=newWorkSchedule("Kern Co.","Three 24 hour alternating shifts");// shift, start 07:00 for 24 hoursShiftshift=schedule.CreateShift("24 Hour","24 hour shift",newLocalTime(7,0,0),Duration.FromHours(24));// 2 days ON, 2 OFF, 2 ON, 2 OFF, 2 ON, 8 OFFRotationrotation=newRotation("24 Hour","2 days ON, 2 OFF, 2 ON, 2 OFF, 2 ON, 8 OFF");rotation.AddSegment(shift,2,2);rotation.AddSegment(shift,2,2);rotation.AddSegment(shift,2,8);Teamplatoon1=schedule.CreateTeam("Red","A Shift",rotation,newLocalDate(2017,1,8));Teamplatoon2=schedule.CreateTeam("Black","B Shift",rotation,newLocalDate(2017,2,1));Teamplatoon3=schedule.CreateTeam("Green","C Shift",rotation,newLocalDate(2017,1,2));

When printed out for a week of shift instances, the output is:

Schedule:KernCo.(Three24hour alternating shifts)
Rotation duration: PT1296H, Scheduled working time: PT432H
Shifts:(1)24 Hour (24 hour shift),Start:07:00(PT24H),End:07:00Teams:(1) Red (AShift), Rotation start:2017-01-08, Rotation periods:[24 Hour (on),24 Hour (on),(off),(off),24 Hour (on),24 Hour (on),(off),(off),24 Hour (on),24 Hour (on),(off),(off),(off),(off),(off),(off),(off),(off)], Rotation duration: PT432H, Days in rotation:18, Scheduled working time: PT144H, Percentage worked:33.33%,Averagehours worked per week: PT56H
(2) Black (BShift),Rotationstart:2017-02-01, Rotation periods:[24 Hour (on),24 Hour (on),(off),(off),24 Hour (on),24 Hour (on),(off),(off),24 Hour (on),24 Hour (on),(off),(off),(off),(off),(off),(off),(off),(off)], Rotation duration: PT432H, Days in rotation:18, Scheduled working time: PT144H, Percentage worked:33.33%,Averagehours worked per week: PT56H
(3) Green (CShift),Rotationstart:2017-01-02, Rotation periods:[24 Hour (on),24 Hour (on),(off),(off),24 Hour (on),24 Hour (on),(off),(off),24 Hour (on),24 Hour (on),(off),(off),(off),(off),(off),(off),(off),(off)], Rotation duration: PT432H, Days in rotation:18, Scheduled working time: PT144H, Percentage worked:33.33%,Average hours worked per week: PT56H
Total team coverage:100%Working shifts
[1] Day:2017-02-01(1) Team: Black, Shift:24 Hour, Start :2017-02-01T07:00, End :2017-02-02T07:00[2] Day:2017-02-02(1) Team: Black, Shift:24 Hour, Start :2017-02-02T07:00, End :2017-02-03T07:00[3] Day:2017-02-03(1) Team: Red, Shift:24 Hour, Start :2017-02-03T07:00, End :2017-02-04T07:00[4] Day:2017-02-04(1) Team: Red, Shift:24 Hour, Start :2017-02-04T07:00, End :2017-02-05T07:00[5] Day:2017-02-05(1) Team: Black, Shift:24 Hour, Start :2017-02-05T07:00, End :2017-02-06T07:00[6] Day:2017-02-06(1) Team: Black, Shift:24 Hour, Start :2017-02-06T07:00, End :2017-02-07T07:00[7] Day:2017-02-07(1) Team: Green, Shift:24 Hour, Start :2017-02-07T07:00, End :2017-02-08T07:00

For a fourth example, for a restaurant shift starting at 7 am on August 8, 2024, team member #1 called in sick and is to be replaced by member #10:

WorkScheduleschedule=newWorkSchedule("Restaurant","Two shifts");// day shift (12 hours)Shiftday=schedule.CreateShift("Day","Green",newLocalTime(6,0,0),Duration.FromHours(12));// day shift rotation, 1 days ON, 0 OFFRotationdayRotation=schedule.CreateRotation("Day","One day on, 6 off");dayRotation.AddSegment(day,1,6);LocalDategreenStart=newLocalDate(2024,7,28);TeamsundayDay=schedule.CreateTeam("SundayDay","Sunday day",dayRotation,greenStart);// chef membersTeamMemberone=newTeamMember("Chef, One","Chef","1");TeamMemberten=newTeamMember("Ten","Ten description","10");sundayDay.AddMember(one);// replace member one with tenLocalDateTimeexceptionShift=newLocalDateTime(2024,8,11,7,0,0);TeamMemberExceptionreplacement=newTeamMemberException(exceptionShift);replacement.Removal=one;replacement.Addition=ten;sundayDay.AddMemberException(replacement);// #1 is in the assigned listList<TeamMember>members=sundayDay.AssignedMembers;// but is replaced by #10 for that shift instance:members=sundayDay.GetMembers(exceptionShift);

NuGet

To download the nuget package, the command is: "dotnet add package ShiftSharp --version 2.1.1".

Project Structure

ShiftSharp depends upon .NET 8+ due to use of the NodaTime date and time classes.

ShiftSharp has the following structure:

• /Documentation/html Doxygen HTML files
• . - C# source files
• /Resources - localizable Message.properties file to define error messages.
• ../TestShiftSharp - unit test C# project
• ../dotnetcore - csproj files for .NET Core 3.0 framework

The compiled ShiftSharp.dll can be found under the "resources" link.