} ;
HELP: time+
-{ $values { "time1" "timestamp or duration" } { "time2" "timestamp or duration" } { "time3" "timestamp or duration" } }
+{ $values { "time1" { $or timestamp duration } } { "time2" { $or timestamp duration } } { "time3" { $or timestamp 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 ;"
}
} ;
+HELP: time-
+{ $values { "time1" { $or timestamp duration } } { "time2" { $or timestamp duration } } { "time3" { $or timestamp duration } } }
+{ $description "Subtracts two durations to produce a duration or subtracts a duration from a timestamp to produce a timestamp. The calculation takes timezones into account." }
+{ $examples
+ { $example "USING: calendar math.order prettyprint ;"
+ "10 months 2 months time- 8 months <=> ."
+ "+eq+"
+ }
+ { $example "USING: accessors calendar math.order prettyprint ;"
+ "2010 1 1 <date> 3 days time- day>> ."
+ "29"
+ }
+} ;
+
+{ time+ time- } related-words
+
HELP: duration>years
{ $values { "duration" duration } { "x" number } }
{ $description "Calculates the length of a duration in years." }
{ duration>years duration>months duration>days duration>hours duration>minutes duration>seconds duration>milliseconds duration>microseconds duration>nanoseconds } related-words
-HELP: time-
-{ $values { "time1" "timestamp or duration" } { "time2" "timestamp or duration" } { "time3" "timestamp or duration" } }
-{ $description "Subtracts two durations to produce a duration or subtracts a duration from a timestamp to produce a timestamp. The calculation takes timezones into account." }
-{ $examples
- { $example "USING: calendar math.order prettyprint ;"
- "10 months 2 months time- 8 months <=> ."
- "+eq+"
- }
- { $example "USING: accessors calendar math.order prettyprint ;"
- "2010 1 1 <date> 3 days time- day>> ."
- "29"
- }
-} ;
-
HELP: convert-timezone
-{ $values { "timestamp" timestamp } { "duration" duration } { "timestamp'" timestamp } }
+{ $values { "timestamp" timestamp } { "duration" duration } }
{ $description "Converts the " { $snippet "timestamp" } "'s " { $snippet "gmt-offset" } " to the GMT offset represented by the " { $snippet "duration" } "." }
{ $examples
{ $example "USING: accessors calendar prettyprint ;"
- "gmt noon instant -5 >>hour convert-timezone gmt-offset>> hour>> ."
+ "now-gmt noon instant -5 >>hour convert-timezone gmt-offset>> hour>> ."
"-5"
}
} ;
HELP: >local-time
{ $values { "timestamp" timestamp } { "timestamp'" timestamp } }
-{ $description "Converts the " { $snippet "timestamp" } " to the timezone of your computer." }
+{ $description "Converts the " { $snippet "timestamp" } " to the timezone of your computer, returning a new " { $link timestamp } " instance." }
{ $examples
{ $example "USING: accessors calendar kernel prettyprint ;"
- "now gmt >local-time [ gmt-offset>> ] same? ."
+ "now now-gmt >local-time [ gmt-offset>> ] same? ."
"t"
}
} ;
HELP: >gmt
{ $values { "timestamp" timestamp } { "timestamp'" timestamp } }
-{ $description "Converts the " { $snippet "timestamp" } " to the GMT timezone." }
+{ $description "Converts the " { $snippet "timestamp" } " to the GMT timezone, returning a new " { $link timestamp } " instance." }
{ $examples
{ $example "USING: accessors calendar kernel prettyprint ;"
"now >gmt gmt-offset>> hour>> ."
}
} ;
-HELP: time*
+HELP: local-time
+{ $values { "timestamp" timestamp } }
+{ $description "Set the time zone to the computer's local timezone." }
+{ $notes "The time is not converted, if you want that then call " { $link >local-time } "." } ;
+
+HELP: gmt
+{ $values { "timestamp" timestamp } }
+{ $description "Set the time zone to GMT." }
+{ $notes "The time is not converted, if you want that then call " { $link >gmt } "." } ;
+
+{ local-time >local-time convert-local-time gmt >gmt convert-gmt utc >utc convert-utc convert-timezone } related-words
+
+HELP: duration*
{ $values { "obj1" object } { "obj2" object } { "obj3" object } }
{ $description "Multiplies each time slot of a timestamp or duration by a number and make a new duration from the result. Used in the implementation of " { $link before } "." } ;
-{ time+ time- time* } related-words
HELP: before
{ $values { "duration" duration } { "-duration" duration } }
}
} ;
-HELP: gmt
+HELP: now-gmt
{ $values { "timestamp" timestamp } }
{ $description "Returns the time right now, but in the GMT timezone." } ;
-{ gmt now } related-words
+{ now now-gmt } related-words
HELP: now
{ $values { "timestamp" timestamp } }
}
} ;
-HELP: zeller-congruence
+HELP: (day-of-week)
{ $values { "year" integer } { "month" integer } { "day" integer } { "n" integer } }
-{ $description "An implementation of an algorithm that computes the day of the week given a date. Days are indexed starting from Sunday, which is index 0." }
+{ $description "An implementation of the Zeller's congruence algorithm that computes the day of the week given a date. Days are indexed starting from Sunday, which is index 0." }
{ $notes "User code should use the " { $link day-of-week } " word, which takes a " { $snippet "timestamp" } " instead of integers." } ;
HELP: days-in-year
-{ $values { "obj" "a timestamp or an integer" } { "n" integer } }
+{ $values { "obj" { $or timestamp integer } } { "n" integer } }
{ $description "Calculates the number of days in a given year." }
{ $examples
{ $example "USING: calendar prettyprint ;"
} ;
HELP: sunday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Sunday from the current week, which starts on a Sunday." } ;
HELP: monday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Monday from the current week, which starts on a Sunday." } ;
HELP: tuesday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Tuesday from the current week, which starts on a Sunday." } ;
HELP: wednesday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Wednesday from the current week, which starts on a Sunday." } ;
HELP: thursday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Thursday from the current week, which starts on a Sunday." } ;
HELP: friday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Friday from the current week, which starts on a Sunday." } ;
HELP: saturday
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
+{ $values { "timestamp" timestamp } }
{ $description "Returns the Saturday from the current week, which starts on a Sunday." } ;
{ sunday monday tuesday wednesday thursday friday saturday } related-words
HELP: midnight
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
-{ $description "Returns a new timestamp that represents the day at midnight, or the beginning of the day." } ;
+{ $values { "timestamp" timestamp } }
+{ $description "Sets the timestamp to represent the day at midnight, or the beginning of the day." } ;
HELP: noon
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
-{ $description "Returns a new timestamp that represents the day at noon, or the middle of the day." } ;
+{ $values { "timestamp" timestamp } }
+{ $description "Sets the timestamp to represent the day at noon, or the middle of the day." } ;
HELP: today
{ $values { "timestamp" timestamp } }
-{ $description "Returns a timestamp that represents today at midnight." } ;
+{ $description "Sets the timestamp to represents today at midnight." } ;
HELP: start-of-month
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
-{ $description "Returns a new timestamp with the day set to one." } ;
+{ $values { "timestamp" timestamp } }
+{ $description "Sets the timestamp with the day set to one." } ;
HELP: start-of-week
-{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
-{ $description "Returns a new timestamp where the day of the week is Sunday." } ;
+{ $values { "timestamp" timestamp } }
+{ $description "Sets the timestamp with the day of the week set to Sunday." } ;
HELP: start-of-year
-{ $values { "object" object } { "new-timestamp" timestamp } }
-{ $description "Returns a new timestamp with the month and day set to one, or January 1 of the input timestamp, given a year or a timestamp." } ;
+{ $values { "object" object } { "timestamp" timestamp } }
+{ $description "Sets the timestamp with the month and day set to one, or January 1 of the input timestamp, given a year or a timestamp." } ;
HELP: time-since-midnight
{ $values { "timestamp" timestamp } { "duration" duration } }
{ $subsections
>local-time
>gmt
+ >utc
convert-timezone
}
"Timestamps relative to each other:"
{ $subsections time+ }
"Subtracting:"
{ $subsections time- }
-"Element-wise multiplication:"
-{ $subsections time* } ;
+"Multiplying durations:"
+{ $subsections duration* } ;
ARTICLE: "using-durations" "Using durations"
"Creating a duration object:"
projects / factor.git / blobdiff