# Time Duration Fuzzy Terms

## Starting Time Fuzzy Terms:

znn represents the Starting Time Fuzzy term within the preceding sharp time (for any term equal or greater than the applicable reference time frame, if previously specified) and/or which serves as context for predefined sharp time (for any term smaller than the applicable reference time frame, if previously specified). When no previous time is specified, it means that any occurrence of the fuzzy term is valid.

Example: (z15) means the beginning of peak hours on any day in any month in any year

Example: (M12z15) means the beginning of peak hours in December in any year.

Sharp terms like dnn, hnn, mnn, etc may evaluate relative to a fuzzy context, if their default reference time frame is not present.

Example: (d3s5) means beginning of third day of winter (default context for dnn would be day of month)

Example: (-m30z15) means 30 minutes before beginning of peak hours (default context for mnn would be hour in a day).

znn term may be preceded by a minus sign (-znn); unlike for sharp time terms, the minus sign alters the term semantics from starts (or ends) at beginning of to starts (or ends) at end of (e.g. (M12-z15) means the end of peak hour in December in any year, whereas (-m30-z15) means 30 minutes before end of peak hour).

Fuzzy terms numbered z0-z49 are valid Starting Time fuzzy terms.

### Table of Starting Time Fuzzy Terms:

Time unit Reference time frame Notation Explanation (terms in parenthesis apply when minus in use)
External Any (-)z0 Starting/ending (at the end) of a period controlled by external device. Devices in the Korean city of Kwatchen which use digital signs to control flow of traffic. Ramps which regulate access by means of centralised traffic control in the US.
Sunrise Within a day (-)z1 Starts/ends at Sunrise (Sunset)
Sunset Within a day (-)z2 Starts/ends at Sunset (Sunrise)
School Within a year, week, or day (-)z3 Starts/ends at (the end of) any school period (date and hour)
Holiday Within a year (-)z4 Starts/ends at (the end of) any Holiday
Winter Within a year (-)z5 Beginning/ending of (the end of) Winter
Spring Within a year (-)z6 Beginning/ending of (the end of) Spring
Summer Within a year (-)z7 Beginning/ending of (the end of) Summer
Autumn Within a year (-)z8 Beginning/ending of (the end of) Autumn
High Tide Within a day (-)z9 Starts/ends at (the end of) High Tide
Low Tide Within a day (-)z10 Starts/ends at (the end of) Low Tide
High Water Within a year (-)z11 Starts/ends at (the end of) River High Water
Low Water Within a year (-)z12 Starts/ends at (the end of) River Low Water
Wet Season Within a year (-)z13 Starts/ends at (the end of) Wet Season (Rainy Season)
Dry Season Within a year (-)z14 Starts/ends at (the end of) Dry Season
Peak Hours Within a year, month,week, or a day (-)z15 Starts/ends at (the end of) Peak Hours: Peak hours include rush hour and activity/scheduled event based times. These would vary by location and by season. Peak hours are applicable not only to road networks but ferries as well. Activities like shopping, beach going, and skiing. Scheduled events like parades, sporting events, concerts, conventions.
Off-Peak Hours Within a year, month, week, or a day (-)z16 Starts/ends at (the end of) Off-Peak Hours
Rain/wet conditions Any (-)z17 Starts/ends at (the end of) Rain/wet conditions
Snow Any (-)z18 Starts/ends at (the end of) Snow
Fog Any (-)z19 Starts/ends at (the end of) Fog
Dust Any (-)z20 Starts/ends at (the end of) Dust
Dawn Within a day (-)z21 Starts/ends at (the end of) Dawn
Dusk Within a day (-)z22 Starts/ends at (the end of) Dusk
User Defined Any (-)z23-z49 User Defined Starting/ending Fuzzy types

## Time Duration Fuzzy Terms:

znnn represents the Time Duration Fuzzy term. Fuzzy terms numbered z50-z100 are valid Time Duration fuzzy terms.

znnn term may be preceded by a minus sign (-znnn); unlike for sharp time terms, the minus sign alters the term semantics to become the complementary (e.g. {z55} means during Winter, whereas {-z55} means during non-Winter).

### Table of Time Duration Fuzzy Terms:

Time unit Reference time frame Notation Explanation (terms in parenthesis apply when minus in use)
External Any (-)z50 Duration (complement) period controlled by external device. Devices in the Korean city of Kwatchen which use digital signs to control flow of traffic. Ramps which regulate access by means of centralised traffic control in the US.
Sunrise till Sunset Within a day (-)z51 Duration (complement) of Sunrise till Sunset
Sunset till Sunrise Within a day (-)z52 Duration (complement) of Sunset till Sunrise
School Within a year, week, or day (-)z53 Duration (complement) of School time (a possibly non contiguous duration)
Holiday Within a year (-)z54 Duration (complement) of Holiday (a possibly non contiguous duration)
Winter Within a year (-)z55 Duration (complement) of Winter
Spring Within a year (-)z56 Duration (complement) of Spring
Summer Within a year (-)z57 Duration (complement) of Summer
Autumn Within a year (-)z58 Duration (complement) of Autumn
High Tide Within a day (-)z59 Duration (complement) of "High Tide"
Low Tide Within a day (-)z60 Duration (complement) of "Low Tide"
High Water Within a year (-)z61 Duration (complement) of "River High Water" period
Low Water Within a year (-)z62 Duration (complement) of "River Low Water" period
Wet Season Within a year (-)z63 Duration (complement) of Wet Season (Rainy Season)
Dry Season Within a year (-)z64 Duration (complement) of Dry Season
Peak Hours Within a year, month, week, or a day (-)z65 Duration (complement) of Peak Hours (Rush hours on freeway for instance) (a possibly noncontiguous duration).
Off-Peak Hours Within a year, month, week, or a day (-)z66 Duration (complement) of Off- Peak Hours (a possibly noncontiguous duration)
Rain/wet conditions Any (-)z67 Duration (complement) of Rain/ wet conditions
Snow Any (-)z68 Duration (complement) of Snow
Fog Any (-)z69 Duration (complement) of Fog
Dust Any (-)z70 Duration (complement) of Dust
Dawn Within a day (-)z71 Duration (complement) of Dawn
Dusk Within a day (-)z72 Duration (complement) of Dusk
User Defined Any (-)z73-(-)z99 User Defined Durations (complement) of Fuzzy types
Always Any (-)z100 Duration of always (never)