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Date
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alphaindex.h
26.42
KB
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2019-11-07 06:58
appendable.h
8.43
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2019-11-07 06:58
basictz.h
8.84
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2019-11-07 06:58
brkiter.h
27.64
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2019-11-07 06:58
bytestream.h
9.54
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2019-11-07 06:58
bytestrie.h
19.26
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2019-11-07 06:58
bytestriebuilder.h
7.02
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2019-11-07 06:58
calendar.h
105.06
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2019-11-07 06:58
caniter.h
7.37
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2019-11-07 06:58
casemap.h
25.26
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2019-11-07 06:58
char16ptr.h
7.16
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2019-11-07 06:58
chariter.h
24
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2019-11-07 06:58
choicfmt.h
23.85
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2019-11-07 06:58
coleitr.h
13.7
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2019-11-07 06:58
coll.h
55.59
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2019-11-07 06:58
compactdecimalformat.h
6.81
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2019-11-07 06:58
curramt.h
3.69
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currpinf.h
7.24
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2019-11-07 06:58
currunit.h
3.99
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2019-11-07 06:58
datefmt.h
40.37
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2019-11-07 06:58
dbbi.h
1.11
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2019-11-07 06:58
dcfmtsym.h
20.1
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2019-11-07 06:58
decimfmt.h
87.82
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2019-11-07 06:58
docmain.h
6.96
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2019-11-07 06:58
dtfmtsym.h
37.64
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2019-11-07 06:58
dtintrv.h
3.78
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2019-11-07 06:58
dtitvfmt.h
46.56
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2019-11-07 06:58
dtitvinf.h
18.46
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2019-11-07 06:58
dtptngen.h
25.08
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2019-11-07 06:58
dtrule.h
8.62
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2019-11-07 06:58
edits.h
20.67
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2019-11-07 06:58
enumset.h
2.08
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2019-11-07 06:58
errorcode.h
4.78
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2019-11-07 06:58
fieldpos.h
8.63
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2019-11-07 06:58
filteredbrk.h
5.24
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2019-11-07 06:58
fmtable.h
24.36
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2019-11-07 06:58
format.h
12.44
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2019-11-07 06:58
formattedvalue.h
9.73
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2019-11-07 06:58
fpositer.h
2.98
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2019-11-07 06:58
gender.h
3.27
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2019-11-07 06:58
gregocal.h
31.57
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2019-11-07 06:58
icudataver.h
1.03
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2019-11-07 06:58
icuplug.h
11.88
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2019-11-07 06:58
idna.h
12.63
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2019-11-07 06:58
listformatter.h
9.42
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2019-11-07 06:58
localebuilder.h
10.54
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2019-11-07 06:58
localpointer.h
19.69
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2019-11-07 06:58
locdspnm.h
7.06
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2019-11-07 06:58
locid.h
44.94
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2019-11-07 06:58
measfmt.h
11.44
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2019-11-07 06:58
measunit.h
88.17
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2019-11-07 06:58
measure.h
4.26
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2019-11-07 06:58
messagepattern.h
33.65
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2019-11-07 06:58
msgfmt.h
44.04
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2019-11-07 06:58
normalizer2.h
33.97
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2019-11-07 06:58
normlzr.h
30.74
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2019-11-07 06:58
nounit.h
2.63
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2019-11-07 06:58
numberformatter.h
84.62
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2019-11-07 06:58
numberrangeformatter.h
29.93
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2019-11-07 06:58
numfmt.h
49.35
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2019-11-07 06:58
numsys.h
7.13
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2019-11-07 06:58
parseerr.h
3.08
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2019-11-07 06:58
parsepos.h
5.5
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2019-11-07 06:58
platform.h
27.1
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2019-11-07 06:58
plurfmt.h
25.18
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2019-11-07 06:58
plurrule.h
18.33
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2019-11-07 06:58
ptypes.h
3.49
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2019-11-07 06:58
putil.h
6.33
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2019-11-07 06:58
rbbi.h
26.42
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2019-11-07 06:58
rbnf.h
49.79
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2019-11-07 06:58
rbtz.h
15.47
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2019-11-07 06:58
regex.h
84.3
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2019-11-07 06:58
region.h
9.12
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2019-11-07 06:58
reldatefmt.h
22.37
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2019-11-07 06:58
rep.h
9.5
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2019-11-07 06:58
resbund.h
18.01
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2019-11-07 06:58
schriter.h
6.26
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2019-11-07 06:58
scientificnumberformatter.h
6.32
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2019-11-07 06:58
search.h
22.21
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2019-11-07 06:58
selfmt.h
14.24
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2019-11-07 06:58
simpleformatter.h
12.53
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2019-11-07 06:58
simpletz.h
45.3
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2019-11-07 06:58
smpdtfmt.h
70.9
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2019-11-07 06:58
sortkey.h
11.12
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2019-11-07 06:58
std_string.h
1015
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2019-11-07 06:58
strenum.h
10.04
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2019-11-07 06:58
stringoptions.h
5.79
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2019-11-07 06:58
stringpiece.h
6.46
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2019-11-07 06:58
stringtriebuilder.h
15.27
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2019-11-07 06:58
stsearch.h
21.29
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2019-11-07 06:58
symtable.h
4.21
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2019-11-07 06:58
tblcoll.h
36.4
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2019-11-07 06:58
timezone.h
41.2
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2019-11-07 06:58
tmunit.h
3.29
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2019-11-07 06:58
tmutamt.h
4.8
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2019-11-07 06:58
tmutfmt.h
7.79
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2019-11-07 06:58
translit.h
65.76
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2019-11-07 06:58
tzfmt.h
42.82
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2019-11-07 06:58
tznames.h
16.79
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2019-11-07 06:58
tzrule.h
35.32
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2019-11-07 06:58
tztrans.h
6.07
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2019-11-07 06:58
ubidi.h
89.56
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2019-11-07 06:58
ubiditransform.h
12.65
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2019-11-07 06:58
ubrk.h
23.97
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2019-11-07 06:58
ucal.h
55.54
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2019-11-07 06:58
ucasemap.h
15.18
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2019-11-07 06:58
ucat.h
5.36
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2019-11-07 06:58
uchar.h
140.66
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2019-11-07 06:58
ucharstrie.h
21.06
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2019-11-07 06:58
ucharstriebuilder.h
7.14
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2019-11-07 06:58
uchriter.h
13.14
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2019-11-07 06:58
uclean.h
11.21
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2019-11-07 06:58
ucnv.h
83.09
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2019-11-07 06:58
ucnv_cb.h
6.59
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2019-11-07 06:58
ucnv_err.h
20.99
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2019-11-07 06:58
ucnvsel.h
6.14
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2019-11-07 06:58
ucol.h
61.39
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2019-11-07 06:58
ucoleitr.h
9.46
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2019-11-07 06:58
uconfig.h
12.05
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2019-11-07 06:58
ucpmap.h
5.58
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2019-11-07 06:58
ucptrie.h
22.29
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2019-11-07 06:58
ucsdet.h
14.67
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2019-11-07 06:58
ucurr.h
16.15
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2019-11-07 06:58
udat.h
60.81
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2019-11-07 06:58
udata.h
15.53
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2019-11-07 06:58
udateintervalformat.h
10.03
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2019-11-07 06:58
udatpg.h
25.94
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2019-11-07 06:58
udisplaycontext.h
5.89
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2019-11-07 06:58
uenum.h
7.78
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2019-11-07 06:58
ufieldpositer.h
4.36
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2019-11-07 06:58
uformattable.h
10.94
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2019-11-07 06:58
uformattedvalue.h
12.14
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2019-11-07 06:58
ugender.h
2
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2019-11-07 06:58
uidna.h
33.37
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2019-11-07 06:58
uiter.h
22.77
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2019-11-07 06:58
uldnames.h
10.45
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2019-11-07 06:58
ulistformatter.h
8.83
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2019-11-07 06:58
uloc.h
50.75
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2019-11-07 06:58
ulocdata.h
11.26
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2019-11-07 06:58
umachine.h
13.19
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2019-11-07 06:58
umisc.h
1.33
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2019-11-07 06:58
umsg.h
24.23
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2019-11-07 06:58
umutablecptrie.h
8.28
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2019-11-07 06:58
unifilt.h
3.63
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2019-11-07 06:58
unifunct.h
3.98
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2019-11-07 06:58
unimatch.h
6.04
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2019-11-07 06:58
unirepl.h
3.32
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2019-11-07 06:58
uniset.h
64.88
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2019-11-07 06:58
unistr.h
170.39
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2019-11-07 06:58
unorm.h
20.45
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2019-11-07 06:58
unorm2.h
24.66
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2019-11-07 06:58
unum.h
53.55
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2019-11-07 06:58
unumberformatter.h
25.19
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2019-11-07 06:58
unumsys.h
7.21
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2019-11-07 06:58
uobject.h
10.85
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2019-11-07 06:58
upluralrules.h
7.88
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2019-11-07 06:58
uregex.h
72.05
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2019-11-07 06:58
uregion.h
9.84
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2019-11-07 06:58
ureldatefmt.h
17.26
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2019-11-07 06:58
urename.h
131.4
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2019-11-07 06:58
urep.h
5.38
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2019-11-07 06:58
ures.h
36.54
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2019-11-07 06:58
uscript.h
26.87
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usearch.h
38.12
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2019-11-07 06:58
uset.h
40
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usetiter.h
9.49
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2019-11-07 06:58
ushape.h
18
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uspoof.h
66.03
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usprep.h
8.14
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ustdio.h
38.54
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2019-11-07 06:58
ustream.h
1.8
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2019-11-07 06:58
ustring.h
72.47
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2019-11-07 06:58
ustringtrie.h
3.15
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2019-11-07 06:58
utext.h
58.11
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2019-11-07 06:58
utf.h
7.86
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2019-11-07 06:58
utf16.h
22.33
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2019-11-07 06:58
utf32.h
763
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2019-11-07 06:58
utf8.h
29.96
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2019-11-07 06:58
utf_old.h
43.78
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2019-11-07 06:58
utmscale.h
13.78
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2019-11-07 06:58
utrace.h
13.89
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2019-11-07 06:58
utrans.h
25.54
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2019-11-07 06:58
utypes.h
30.38
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2019-11-07 06:58
uvernum.h
6.67
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2019-11-07 06:58
uversion.h
6.7
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2019-11-07 06:58
vtzone.h
20.17
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2019-11-07 06:58
Save
Rename
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2004 - 2008, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************************* */ #ifndef UTMSCALE_H #define UTMSCALE_H #include "unicode/utypes.h" #if !UCONFIG_NO_FORMATTING /** * \file * \brief C API: Universal Time Scale * * There are quite a few different conventions for binary datetime, depending on different * platforms and protocols. Some of these have severe drawbacks. For example, people using * Unix time (seconds since Jan 1, 1970) think that they are safe until near the year 2038. * But cases can and do arise where arithmetic manipulations causes serious problems. Consider * the computation of the average of two datetimes, for example: if one calculates them with * <code>averageTime = (time1 + time2)/2</code>, there will be overflow even with dates * around the present. Moreover, even if these problems don't occur, there is the issue of * conversion back and forth between different systems. * * <p> * Binary datetimes differ in a number of ways: the datatype, the unit, * and the epoch (origin). We'll refer to these as time scales. For example: * * <table border="1" cellspacing="0" cellpadding="4"> * <caption>Table 1: Binary Time Scales</caption> * <tr> * <th align="left">Source</th> * <th align="left">Datatype</th> * <th align="left">Unit</th> * <th align="left">Epoch</th> * </tr> * * <tr> * <td>UDTS_JAVA_TIME</td> * <td>int64_t</td> * <td>milliseconds</td> * <td>Jan 1, 1970</td> * </tr> * <tr> * * <td>UDTS_UNIX_TIME</td> * <td>int32_t or int64_t</td> * <td>seconds</td> * <td>Jan 1, 1970</td> * </tr> * <tr> * <td>UDTS_ICU4C_TIME</td> * * <td>double</td> * <td>milliseconds</td> * <td>Jan 1, 1970</td> * </tr> * <tr> * <td>UDTS_WINDOWS_FILE_TIME</td> * <td>int64_t</td> * * <td>ticks (100 nanoseconds)</td> * <td>Jan 1, 1601</td> * </tr> * <tr> * <td>UDTS_DOTNET_DATE_TIME</td> * <td>int64_t</td> * <td>ticks (100 nanoseconds)</td> * * <td>Jan 1, 0001</td> * </tr> * <tr> * <td>UDTS_MAC_OLD_TIME</td> * <td>int32_t or int64_t</td> * <td>seconds</td> * <td>Jan 1, 1904</td> * * </tr> * <tr> * <td>UDTS_MAC_TIME</td> * <td>double</td> * <td>seconds</td> * <td>Jan 1, 2001</td> * </tr> * * <tr> * <td>UDTS_EXCEL_TIME</td> * <td>?</td> * <td>days</td> * <td>Dec 31, 1899</td> * </tr> * <tr> * * <td>UDTS_DB2_TIME</td> * <td>?</td> * <td>days</td> * <td>Dec 31, 1899</td> * </tr> * * <tr> * <td>UDTS_UNIX_MICROSECONDS_TIME</td> * <td>int64_t</td> * <td>microseconds</td> * <td>Jan 1, 1970</td> * </tr> * </table> * * <p> * All of the epochs start at 00:00 am (the earliest possible time on the day in question), * and are assumed to be UTC. * * <p> * The ranges for different datatypes are given in the following table (all values in years). * The range of years includes the entire range expressible with positive and negative * values of the datatype. The range of years for double is the range that would be allowed * without losing precision to the corresponding unit. * * <table border="1" cellspacing="0" cellpadding="4"> * <tr> * <th align="left">Units</th> * <th align="left">int64_t</th> * <th align="left">double</th> * <th align="left">int32_t</th> * </tr> * * <tr> * <td>1 sec</td> * <td align="right">5.84542x10<sup>11</sup></td> * <td align="right">285,420,920.94</td> * <td align="right">136.10</td> * </tr> * <tr> * * <td>1 millisecond</td> * <td align="right">584,542,046.09</td> * <td align="right">285,420.92</td> * <td align="right">0.14</td> * </tr> * <tr> * <td>1 microsecond</td> * * <td align="right">584,542.05</td> * <td align="right">285.42</td> * <td align="right">0.00</td> * </tr> * <tr> * <td>100 nanoseconds (tick)</td> * <td align="right">58,454.20</td> * <td align="right">28.54</td> * <td align="right">0.00</td> * </tr> * <tr> * <td>1 nanosecond</td> * <td align="right">584.5420461</td> * <td align="right">0.2854</td> * <td align="right">0.00</td> * </tr> * </table> * * <p> * These functions implement a universal time scale which can be used as a 'pivot', * and provide conversion functions to and from all other major time scales. * This datetimes to be converted to the pivot time, safely manipulated, * and converted back to any other datetime time scale. * *<p> * So what to use for this pivot? Java time has plenty of range, but cannot represent * .NET <code>System.DateTime</code> values without severe loss of precision. ICU4C time addresses this by using a * <code>double</code> that is otherwise equivalent to the Java time. However, there are disadvantages * with <code>doubles</code>. They provide for much more graceful degradation in arithmetic operations. * But they only have 53 bits of accuracy, which means that they will lose precision when * converting back and forth to ticks. What would really be nice would be a * <code>long double</code> (80 bits -- 64 bit mantissa), but that is not supported on most systems. * *<p> * The Unix extended time uses a structure with two components: time in seconds and a * fractional field (microseconds). However, this is clumsy, slow, and * prone to error (you always have to keep track of overflow and underflow in the * fractional field). <code>BigDecimal</code> would allow for arbitrary precision and arbitrary range, * but we do not want to use this as the normal type, because it is slow and does not * have a fixed size. * *<p> * Because of these issues, we ended up concluding that the .NET framework's * <code>System.DateTime</code> would be the best pivot. However, we use the full range * allowed by the datatype, allowing for datetimes back to 29,000 BC and up to 29,000 AD. * This time scale is very fine grained, does not lose precision, and covers a range that * will meet almost all requirements. It will not handle the range that Java times do, * but frankly, being able to handle dates before 29,000 BC or after 29,000 AD is of very limited interest. * */ /** * <code>UDateTimeScale</code> values are used to specify the time scale used for * conversion into or out if the universal time scale. * * @stable ICU 3.2 */ typedef enum UDateTimeScale { /** * Used in the JDK. Data is a Java <code>long</code> (<code>int64_t</code>). Value * is milliseconds since January 1, 1970. * * @stable ICU 3.2 */ UDTS_JAVA_TIME = 0, /** * Used on Unix systems. Data is <code>int32_t</code> or <code>int64_t</code>. Value * is seconds since January 1, 1970. * * @stable ICU 3.2 */ UDTS_UNIX_TIME, /** * Used in IUC4C. Data is a <code>double</code>. Value * is milliseconds since January 1, 1970. * * @stable ICU 3.2 */ UDTS_ICU4C_TIME, /** * Used in Windows for file times. Data is an <code>int64_t</code>. Value * is ticks (1 tick == 100 nanoseconds) since January 1, 1601. * * @stable ICU 3.2 */ UDTS_WINDOWS_FILE_TIME, /** * Used in the .NET framework's <code>System.DateTime</code> structure. Data is an <code>int64_t</code>. Value * is ticks (1 tick == 100 nanoseconds) since January 1, 0001. * * @stable ICU 3.2 */ UDTS_DOTNET_DATE_TIME, /** * Used in older Macintosh systems. Data is <code>int32_t</code> or <code>int64_t</code>. Value * is seconds since January 1, 1904. * * @stable ICU 3.2 */ UDTS_MAC_OLD_TIME, /** * Used in newer Macintosh systems. Data is a <code>double</code>. Value * is seconds since January 1, 2001. * * @stable ICU 3.2 */ UDTS_MAC_TIME, /** * Used in Excel. Data is an <code>?unknown?</code>. Value * is days since December 31, 1899. * * @stable ICU 3.2 */ UDTS_EXCEL_TIME, /** * Used in DB2. Data is an <code>?unknown?</code>. Value * is days since December 31, 1899. * * @stable ICU 3.2 */ UDTS_DB2_TIME, /** * Data is a <code>long</code>. Value is microseconds since January 1, 1970. * Similar to Unix time (linear value from 1970) and struct timeval * (microseconds resolution). * * @stable ICU 3.8 */ UDTS_UNIX_MICROSECONDS_TIME, #ifndef U_HIDE_DEPRECATED_API /** * The first unused time scale value. The limit of this enum * @deprecated ICU 59 The numeric value may change over time, see ICU ticket #12420. */ UDTS_MAX_SCALE #endif /* U_HIDE_DEPRECATED_API */ } UDateTimeScale; /** * <code>UTimeScaleValue</code> values are used to specify the time scale values * to <code>utmscale_getTimeScaleValue</code>. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ typedef enum UTimeScaleValue { /** * The constant used to select the units vale * for a time scale. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ UTSV_UNITS_VALUE = 0, /** * The constant used to select the epoch offset value * for a time scale. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ UTSV_EPOCH_OFFSET_VALUE=1, /** * The constant used to select the minimum from value * for a time scale. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ UTSV_FROM_MIN_VALUE=2, /** * The constant used to select the maximum from value * for a time scale. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ UTSV_FROM_MAX_VALUE=3, /** * The constant used to select the minimum to value * for a time scale. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ UTSV_TO_MIN_VALUE=4, /** * The constant used to select the maximum to value * for a time scale. * * @see utmscale_getTimeScaleValue * * @stable ICU 3.2 */ UTSV_TO_MAX_VALUE=5, #ifndef U_HIDE_INTERNAL_API /** * The constant used to select the epoch plus one value * for a time scale. * * NOTE: This is an internal value. DO NOT USE IT. May not * actually be equal to the epoch offset value plus one. * * @see utmscale_getTimeScaleValue * * @internal ICU 3.2 */ UTSV_EPOCH_OFFSET_PLUS_1_VALUE=6, /** * The constant used to select the epoch plus one value * for a time scale. * * NOTE: This is an internal value. DO NOT USE IT. May not * actually be equal to the epoch offset value plus one. * * @see utmscale_getTimeScaleValue * * @internal ICU 3.2 */ UTSV_EPOCH_OFFSET_MINUS_1_VALUE=7, /** * The constant used to select the units round value * for a time scale. * * NOTE: This is an internal value. DO NOT USE IT. * * @see utmscale_getTimeScaleValue * * @internal ICU 3.2 */ UTSV_UNITS_ROUND_VALUE=8, /** * The constant used to select the minimum safe rounding value * for a time scale. * * NOTE: This is an internal value. DO NOT USE IT. * * @see utmscale_getTimeScaleValue * * @internal ICU 3.2 */ UTSV_MIN_ROUND_VALUE=9, /** * The constant used to select the maximum safe rounding value * for a time scale. * * NOTE: This is an internal value. DO NOT USE IT. * * @see utmscale_getTimeScaleValue * * @internal ICU 3.2 */ UTSV_MAX_ROUND_VALUE=10, #endif /* U_HIDE_INTERNAL_API */ #ifndef U_HIDE_DEPRECATED_API /** * The number of time scale values, in other words limit of this enum. * * @see utmscale_getTimeScaleValue * @deprecated ICU 59 The numeric value may change over time, see ICU ticket #12420. */ UTSV_MAX_SCALE_VALUE=11 #endif /* U_HIDE_DEPRECATED_API */ } UTimeScaleValue; /** * Get a value associated with a particular time scale. * * @param timeScale The time scale * @param value A constant representing the value to get * @param status The status code. Set to <code>U_ILLEGAL_ARGUMENT_ERROR</code> if arguments are invalid. * @return - the value. * * @stable ICU 3.2 */ U_STABLE int64_t U_EXPORT2 utmscale_getTimeScaleValue(UDateTimeScale timeScale, UTimeScaleValue value, UErrorCode *status); /* Conversion to 'universal time scale' */ /** * Convert a <code>int64_t</code> datetime from the given time scale to the universal time scale. * * @param otherTime The <code>int64_t</code> datetime * @param timeScale The time scale to convert from * @param status The status code. Set to <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the conversion is out of range. * * @return The datetime converted to the universal time scale * * @stable ICU 3.2 */ U_STABLE int64_t U_EXPORT2 utmscale_fromInt64(int64_t otherTime, UDateTimeScale timeScale, UErrorCode *status); /* Conversion from 'universal time scale' */ /** * Convert a datetime from the universal time scale to a <code>int64_t</code> in the given time scale. * * @param universalTime The datetime in the universal time scale * @param timeScale The time scale to convert to * @param status The status code. Set to <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the conversion is out of range. * * @return The datetime converted to the given time scale * * @stable ICU 3.2 */ U_STABLE int64_t U_EXPORT2 utmscale_toInt64(int64_t universalTime, UDateTimeScale timeScale, UErrorCode *status); #endif /* #if !UCONFIG_NO_FORMATTING */ #endif