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Date
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alphaindex.h
26.42
KB
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2019-07-23 18:49
appendable.h
8.43
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2019-07-23 18:49
basictz.h
8.84
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2019-07-23 18:49
brkiter.h
27.53
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2019-07-23 18:49
bytestream.h
9.54
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2019-07-23 18:49
bytestrie.h
19.26
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2019-07-23 18:49
bytestriebuilder.h
7.02
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calendar.h
105.06
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2019-07-23 18:49
caniter.h
7.37
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casemap.h
25.26
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2019-07-23 18:49
char16ptr.h
7.16
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chariter.h
24
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choicfmt.h
23.85
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coleitr.h
13.7
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2019-07-23 18:49
coll.h
55.59
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2019-07-23 18:49
compactdecimalformat.h
6.81
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2019-07-23 18:49
curramt.h
3.69
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currpinf.h
7.24
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currunit.h
3.52
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datefmt.h
40.37
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2019-07-23 18:49
dbbi.h
1.11
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2019-07-23 18:49
dcfmtsym.h
20.1
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2019-07-23 18:49
decimfmt.h
86.4
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2019-07-23 18:49
docmain.h
6.72
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2019-07-23 18:49
dtfmtsym.h
37.64
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2019-07-23 18:49
dtintrv.h
3.76
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dtitvfmt.h
42.87
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dtitvinf.h
18.46
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2019-07-23 18:49
dtptngen.h
25.03
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2019-07-23 18:49
dtrule.h
8.62
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2019-07-23 18:49
edits.h
20.67
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2019-07-23 18:49
enumset.h
2.08
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2019-07-23 18:49
errorcode.h
4.78
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2019-07-23 18:49
fieldpos.h
8.63
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2019-07-23 18:49
filteredbrk.h
5.24
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2019-07-23 18:49
fmtable.h
24.36
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2019-07-23 18:49
format.h
12.44
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2019-07-23 18:49
fpositer.h
2.98
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2019-07-23 18:49
gender.h
3.27
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2019-07-23 18:49
gregocal.h
31.57
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2019-07-23 18:49
icudataver.h
1.03
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2019-07-23 18:49
icuplug.h
11.88
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2019-07-23 18:49
idna.h
12.63
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2019-07-23 18:49
listformatter.h
6.18
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2019-07-23 18:49
localpointer.h
16.88
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2019-07-23 18:49
locdspnm.h
7.05
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2019-07-23 18:49
locid.h
44.92
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2019-07-23 18:49
measfmt.h
12.01
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2019-07-23 18:49
measunit.h
38.5
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2019-07-23 18:49
measure.h
4.26
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2019-07-23 18:49
messagepattern.h
33.65
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2019-07-23 18:49
msgfmt.h
43.36
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2019-07-23 18:49
normalizer2.h
33.97
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normlzr.h
30.74
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2019-07-23 18:49
nounit.h
2.63
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2019-07-23 18:49
numberformatter.h
87.07
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2019-07-23 18:49
numberrangeformatter.h
28.74
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2019-07-23 18:49
numfmt.h
49.14
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2019-07-23 18:49
numsys.h
6.73
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parseerr.h
3.08
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2019-07-23 18:49
parsepos.h
5.45
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2019-07-23 18:49
platform.h
27.1
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2019-07-23 18:49
plurfmt.h
25.18
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plurrule.h
17.42
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ptypes.h
3.49
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putil.h
6.33
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rbbi.h
26.41
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rbnf.h
49.79
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2019-07-23 18:49
rbtz.h
15.47
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regex.h
84.91
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2019-07-23 18:49
region.h
9.12
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2019-07-23 18:49
reldatefmt.h
14.46
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2019-07-23 18:49
rep.h
9.5
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2019-07-23 18:49
resbund.h
18.01
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schriter.h
6.26
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2019-07-23 18:49
scientificnumberformatter.h
6.32
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2019-07-23 18:49
search.h
22.21
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2019-07-23 18:49
selfmt.h
14.24
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2019-07-23 18:49
simpleformatter.h
11.43
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2019-07-23 18:49
simpletz.h
45.3
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smpdtfmt.h
70.74
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2019-07-23 18:49
sortkey.h
11.12
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2019-07-23 18:49
std_string.h
1015
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strenum.h
10.04
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2019-07-23 18:49
stringoptions.h
5.79
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stringpiece.h
6.46
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2019-07-23 18:49
stringtriebuilder.h
15.27
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2019-07-23 18:49
stsearch.h
21.29
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symtable.h
4.21
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2019-07-23 18:49
tblcoll.h
36.4
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2019-07-23 18:49
timezone.h
40.88
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2019-07-23 18:49
tmunit.h
3.29
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tmutamt.h
4.8
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2019-07-23 18:49
tmutfmt.h
7.79
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2019-07-23 18:49
translit.h
65.76
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2019-07-23 18:49
tzfmt.h
42.82
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2019-07-23 18:49
tznames.h
16.79
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tzrule.h
35.32
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2019-07-23 18:49
tztrans.h
6.07
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2019-07-23 18:49
ubidi.h
89.56
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2019-07-23 18:49
ubiditransform.h
12.65
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2019-07-23 18:49
ubrk.h
23.97
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2019-07-23 18:49
ucal.h
55.2
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ucasemap.h
15.18
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2019-07-23 18:49
ucat.h
5.36
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2019-07-23 18:49
uchar.h
139.96
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2019-07-23 18:49
ucharstrie.h
21.06
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2019-07-23 18:49
ucharstriebuilder.h
7.14
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2019-07-23 18:49
uchriter.h
13.14
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2019-07-23 18:49
uclean.h
11.21
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2019-07-23 18:49
ucnv.h
83.09
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ucnv_cb.h
6.59
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ucnv_err.h
20.99
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ucnvsel.h
6.14
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2019-07-23 18:49
ucol.h
61.39
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ucoleitr.h
9.46
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uconfig.h
11.67
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ucpmap.h
5.58
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ucptrie.h
22.29
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ucsdet.h
14.67
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ucurr.h
15.57
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udat.h
60.13
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2019-07-23 18:49
udata.h
15.53
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2019-07-23 18:49
udateintervalformat.h
6.79
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2019-07-23 18:49
udatpg.h
26.04
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2019-07-23 18:49
udisplaycontext.h
5.89
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2019-07-23 18:49
uenum.h
7.78
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2019-07-23 18:49
ufieldpositer.h
4.36
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2019-07-23 18:49
uformattable.h
10.94
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ugender.h
2
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uidna.h
33.37
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2019-07-23 18:49
uiter.h
22.77
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2019-07-23 18:49
uldnames.h
10.45
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2019-07-23 18:49
ulistformatter.h
5.03
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2019-07-23 18:49
uloc.h
50.75
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ulocdata.h
11.26
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umachine.h
13.19
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umisc.h
1.33
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umsg.h
24.23
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umutablecptrie.h
8.28
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unifilt.h
3.63
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unifunct.h
3.98
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unimatch.h
6.04
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unirepl.h
3.32
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uniset.h
64.25
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unistr.h
174.4
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2019-07-23 18:49
unorm.h
20.45
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unorm2.h
24.66
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unum.h
53.38
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unumberformatter.h
23.76
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unumsys.h
7.14
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uobject.h
10.7
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upluralrules.h
6.72
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uregex.h
72.05
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uregion.h
9.84
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ureldatefmt.h
12.22
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urename.h
127.73
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urep.h
5.38
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ures.h
36.53
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uscript.h
26.52
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usearch.h
38.12
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uset.h
40
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usetiter.h
9.49
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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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ustream.h
1.8
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ustring.h
72.47
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ustringtrie.h
3.15
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utext.h
58.11
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utf.h
7.86
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utf16.h
22.33
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utf32.h
763
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utf8.h
30.01
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utf_old.h
43.78
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utmscale.h
13.78
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utrace.h
13.89
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utrans.h
25.54
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utypes.h
30.48
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2019-07-23 18:49
uvernum.h
6.06
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uversion.h
6.7
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2019-07-23 18:49
vtzone.h
20.17
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2019-07-23 18:49
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// © 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