2title = "3c: Urbit Time"
8Time since beginning of time
10Produce the date tuple of `[y=@ud m=@ud d=@ud]` of the year, month, and
11day from a number of days from the beginning of the Gregorian calendar.
15`day` is a an unsigned decimal.
19A cell of unsigned decimals.
26 ^- [y=@ud m=@ud d=@ud]
27 =+ [era=0 cet=0 lep=*?]
28 => .(era (div day era:yo), day (mod day era:yo))
30 ?: (lth day +(cet:yo))
32 => .(lep |, cet 1, day (sub day +(cet:yo)))
33 .(cet (add cet (div day cet:yo)), day (mod day cet:yo))
34 =+ yer=(add (mul 400 era) (mul 100 cet))
35 |- ^- [y=@ud m=@ud d=@ud]
36 =+ dis=?:(lep 366 365)
39 $(yer ner, day (sub day dis), lep =(0 (end 0 2 ner)))
40 |- ^- [y=@ud m=@ud d=@ud]
41 =+ [mot=0 cah=?:(lep moy:yo moh:yo)]
42 |- ^- [y=@ud m=@ud d=@ud]
46 $(mot +(mot), day (sub day zis))
66Days since beginning of time
68Inverse of `yall`, computes number of days A.D. from y/m/d date as the
69tuple `[yer=@ud mot=@ud day=@ud]`.
73`yer` is an unsigned decimal.
75`mon` is an unsigned decimal.
77`day` is an unsigned decimal.
87 |= [yer=@ud mot=@ud day=@ud]
89 => .(mot (dec mot), day (dec day))
93 =+ cah=?:((yelp yer) moy:yo moh:yo)
97 $(mot (dec mot), cah (slag 1 cah), day (add day (snag 0 cah)))
102 $(yer ney, day (add day ?:((yelp ney) 366 365)))
103 ?. =(0 (mod yer 100))
105 $(yer nef, day (add day ?:((yelp nef) 1.461 1.460)))
106 ?. =(0 (mod yer 400))
108 $(yer nec, day (add day ?:((yelp nec) 36.525 36.524)))
109 (add day (mul (div yer 400) (add 1 (mul 4 36.524))))
130Accept a parsed date of form `[[a=? y=@ud] m=@ud t=tarp]` and produce
131its `@d` representation.
149 (add 292.277.024.400 y.det)
150 (sub 292.277.024.400 (dec y.det))
151 =+ day=(yawn yer m.det d.t.det)
152 (yule day h.t.det m.t.det s.t.det f.t.det)
158 > (year [[a=%.y y=2.014] m=8 t=[d=4 h=20 m=4 s=57 f=~[0xd940]]])
159 0x8000000d227df4e9d940000000000000
167Produce a parsed daily time format from, `@d`, an atomic date.
185 =+ [muc=4 raw=(end 6 1 now)]
187 ?: |(=(0 raw) =(0 muc))
190 [(cut 4 [muc 1] raw) $(raw (end 4 muc raw))]
191 =+ day=(div sec day:yo)
192 => .(sec (mod sec day:yo))
193 =+ hor=(div sec hor:yo)
194 => .(sec (mod sec hor:yo))
195 =+ mit=(div sec mit:yo)
196 => .(sec (mod sec mit:yo))
197 [day hor mit sec fan]
203 > (yell ~2014.3.20..05.42.53..7456)
204 [d=106.751.991.820.094 h=5 m=42 s=53 f=~[0x7456]]
206 > (yell ~2014.6.9..19.09.40..8b66)
207 [d=106.751.991.820.175 h=19 m=9 s=40 f=~[0x8b66]]
210 [d=106.751.991.733.273 h=0 m=0 s=0 f=~]
218Determines whether a year contains an ISO 8601 leap-week. Produces a flag.
222`yer` is an unsigned decimal.
233 &(=(0 (mod yer 4)) |(!=(0 (mod yer 100)) =(0 (mod yer 400))))
257Produces a `date` from a `@d`.
261`now` is a time atom, `@d`.
275 :- ?: (gth y.ger 292.277.024.400)
276 [a=& y=(sub y.ger 292.277.024.400)]
277 [a=| y=+((sub 292.277.024.400 y.ger))]
278 [m.ger d.ger h.rip m.rip s.rip f.rip]
284 > (yore ~2014.6.6..21.09.15..0a16)
285 [[a=%.y y=2.014] m=6 t=[d=6 h=21 m=9 s=15 f=~[0xa16]]]
291Daily time to time atom
293Accepts a `tarp`, a parsed daily time, and produces a time atom,
321 (add (lsh 4 muc i.f.rip) $(f.rip t.f.rip))
322 (con (lsh 6 1 sec) fac)
329 > =murica (yell ~1776.7.4)
332 [d=106.751.991.733.273 h=0 m=0 s=0 f=~]
335 0x8000000b62aaf5800000000000000000
340 > `@da`(yule (yell ~2014.3.20..05.42.53..7456))
341 ~2014.3.20..05.42.53..7456
343 > `tarp`[31 12 30 0 ~]
344 [d=31 h=12 m=30 s=0 f=~]
346 > `@dr`(yule `tarp`[31 12 30 0 ~])
355Core whose arms contain constants for interacting with earth time.
368Derived by multiplying the number of days in a year
369(365) by the number of years in a century (100), then adding the number
370days from leap-years in a century (24).
391 > (sub (add 24 (mul 100 365)) cet:yo)
400The number of seconds in a day.
427The number of days in a 400-year period, arrived at by multiplying `cet` by four
428and adding one. This is done because every 400 years, there is a leap-year where
429there would otherwise not be.
447 > (sub era:yo (mul 4 cet:yo))
453A year is a leap-year if:
455- it's divisible by 4;
456- **unless** it's divisible by 100;
457- **or** if it's divisible by 400.
464The number of seconds in an hour. Derived by multiplying the number of
465seconds in a minute by the minutes in an hour.
490Maximum 64-bit timestamp
492This is the number of days (starting from 1970) that can be represented in a
49364-bit timestamp. Derived by multiplying `era:yo` by 730,692,561.
502 ++ jes 106.751.991.084.417
514The date is December 4, 292,277,026,596.
521The number of seconds in a minute.
545The days in each month of the Gregorian common year. A list of unsigned
546decimal atoms (Either 28, 30, or 31) denoting the number of days in the
547month at the year at that index.
556 ++ moh `(list @ud)`[31 28 31 30 31 30 31 31 30 31 30 31 ~]
563 ~[31 28 31 30 31 30 31 31 30 31 30 31]
572Days in months of leap-year
574The days in each month of the Gregorian leap-year. A list of unsigned
575decimal atoms (Either 29, 30, or 31) denoting the number of days in the
576month at the leap-year at that index.
585 ++ moy `(list @ud)`[31 29 31 30 31 30 31 31 30 31 30 31 ~]
592 ~[31 29 31 30 31 30 31 31 30 31 30 31]
603The number of seconds in four years. Derived by adding one second to the
604number of seconds in four years.
628The number of seconds in a year. Derived by multiplying the number of
629seconds in a day by 365.
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