{ $description "A duration is a period of time years, months, days, hours, minutes, and seconds. All duration slots can store " { $link real } " numbers." } ;
HELP: timestamp
-{ $description "A timestamp is a date and a time with a timezone offset. Timestamp slots must store integers except for " { $snippet "seconds" } ", which stores reals, and " { $snippet "gmt-offset" } ", which stores a " { $link duration } "." } ;
+{ $description "A timestamp is a date and a time with a timezone offset. Timestamp slots must store integers except for " { $snippet "seconds" } ", which stores reals, and " { $snippet "gmt-offset" } ", which stores a " { $link duration } ". Compare two timestamps with the " { $link <=> } " word." } ;
{ timestamp duration } related-words
} ;
{ >date< >time< } related-words
+
+HELP: instant
+{ $values { "duration" duration } }
+{ $description "Pushes a " { $snippet "duration" } " of zero seconds." } ;
+
+HELP: years
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ year years } related-words
+
+HELP: months
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ month months } related-words
+
+HELP: days
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ day days } related-words
+
+HELP: weeks
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ week weeks } related-words
+
+HELP: hours
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ hour hours } related-words
+
+HELP: minutes
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ minute minutes } related-words
+
+HELP: seconds
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ second seconds } related-words
+
+HELP: milliseconds
+{ $values { "x" number } { "duration" duration } }
+{ $description } ;
+{ millisecond milliseconds } related-words
+
+HELP: leap-year?
+{ $values { "obj" object } { "?" "a boolean" } }
+{ $description "Returns " { $link t } " if the object represents a leap year." }
+{ $examples
+ { $example "USING: calendar prettyprint ;"
+ "2008 leap-year? ."
+ "t"
+ }
+ { $example "USING: calendar prettyprint ;"
+ "2010 1 1 <date> leap-year? ."
+ "f"
+ }
+} ;
+
+HELP: time+
+{ $values { "time1" "timestamp or duration" } { "time2" "timestamp or duration" } { "time3" "timestamp or duration" } }
+{ $description "Adds two durations to produce a duration or adds a timestamp and a duration to produce a timestamp. The calculation takes timezones into account." }
+{ $examples
+ { $example "USING: calendar math.order prettyprint ;"
+ "10 months 2 months time+ 1 year <=> ."
+ "+eq+"
+ }
+ { $example "USING: calendar math.order prettyprint ;"
+ "2010 1 1 <date> 3 days time+ days>> ."
+ "4"
+ }
+} ;
+
USING: arrays kernel math math.functions namespaces sequences
strings system vocabs.loader calendar.backend threads
accessors combinators locals classes.tuple math.order
-memoize summary combinators.short-circuit ;
+memoize summary combinators.short-circuit alias ;
IN: calendar
TUPLE: duration
: >time< ( timestamp -- hour minute second )
[ hour>> ] [ minute>> ] [ second>> ] tri ;
-MEMO: instant ( -- dt ) 0 0 0 0 0 0 <duration> ;
-: years ( n -- dt ) instant clone swap >>year ;
-: months ( n -- dt ) instant clone swap >>month ;
-: days ( n -- dt ) instant clone swap >>day ;
-: weeks ( n -- dt ) 7 * days ;
-: hours ( n -- dt ) instant clone swap >>hour ;
-: minutes ( n -- dt ) instant clone swap >>minute ;
-: seconds ( n -- dt ) instant clone swap >>second ;
-: milliseconds ( n -- dt ) 1000 / seconds ;
+MEMO: instant ( -- duration ) 0 0 0 0 0 0 <duration> ;
+: years ( x -- duration ) instant clone swap >>year ;
+: months ( x -- duration ) instant clone swap >>month ;
+: days ( x -- duration ) instant clone swap >>day ;
+: weeks ( x -- duration ) 7 * days ;
+: hours ( x -- duration ) instant clone swap >>hour ;
+: minutes ( x -- duration ) instant clone swap >>minute ;
+: seconds ( x -- duration ) instant clone swap >>second ;
+: milliseconds ( x -- duration ) 1000 / seconds ;
+ALIAS: year years
+ALIAS: month months
+ALIAS: day days
+ALIAS: week weeks
+ALIAS: hour hours
+ALIAS: minute minutes
+ALIAS: second seconds
+ALIAS: millisecond milliseconds
GENERIC: leap-year? ( obj -- ? )
PRIVATE>
-GENERIC# time+ 1 ( time dt -- time )
+GENERIC# time+ 1 ( time1 time2 -- time3 )
M: timestamp time+
>r clone r> (time+) drop ;
2drop <duration>
] if ;
-: dt>years ( dt -- x )
- #! Uses average month/year length since dt loses calendar
+: dt>years ( duration -- x )
+ #! Uses average month/year length since duration loses calendar
#! data
0 swap
{
M: duration <=> [ dt>years ] compare ;
-: dt>months ( dt -- x ) dt>years months-per-year * ;
-: dt>days ( dt -- x ) dt>years days-per-year * ;
-: dt>hours ( dt -- x ) dt>years hours-per-year * ;
-: dt>minutes ( dt -- x ) dt>years minutes-per-year * ;
-: dt>seconds ( dt -- x ) dt>years seconds-per-year * ;
-: dt>milliseconds ( dt -- x ) dt>seconds 1000 * ;
+: dt>months ( duration -- x ) dt>years months-per-year * ;
+: dt>days ( duration -- x ) dt>years days-per-year * ;
+: dt>hours ( duration -- x ) dt>years hours-per-year * ;
+: dt>minutes ( duration -- x ) dt>years minutes-per-year * ;
+: dt>seconds ( duration -- x ) dt>years seconds-per-year * ;
+: dt>milliseconds ( duration -- x ) dt>seconds 1000 * ;
GENERIC: time- ( time1 time2 -- time )
} 2cleave <duration>
] if ;
-: before ( dt -- -dt )
+: before ( duration -- -duration )
-1 time* ;
M: duration time-
: now ( -- timestamp ) gmt >local-time ;
-: hence ( dt -- timestamp ) now swap time+ ;
-: ago ( dt -- timestamp ) now swap time- ;
+: hence ( duration -- timestamp ) now swap time+ ;
+: ago ( duration -- timestamp ) now swap time- ;
: day-counts { 0 31 28 31 30 31 30 31 31 30 31 30 31 } ; inline
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