OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	05/14/2024 03:54:45 PM	rwxr-xr-x
📄 alphaindex.h	26.52 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 appendable.h	8.53 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 basictz.h	9.86 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 brkiter.h	27.81 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 bytestream.h	10.75 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 bytestrie.h	20.77 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 bytestriebuilder.h	7.46 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 calendar.h	105.88 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 caniter.h	7.44 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 casemap.h	25.33 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 char16ptr.h	7.22 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 chariter.h	24.06 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 choicfmt.h	23.97 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 coleitr.h	13.77 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 coll.h	56.26 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 compactdecimalformat.h	6.88 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 curramt.h	3.78 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 currpinf.h	7.3 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 currunit.h	4.02 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 datefmt.h	40.71 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 dbbi.h	1.19 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 dcfmtsym.h	20.61 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 decimfmt.h	87.57 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 docmain.h	7.21 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 dtfmtsym.h	38.21 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 dtintrv.h	3.84 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 dtitvfmt.h	49.27 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 dtitvinf.h	18.63 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 dtptngen.h	28.84 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 dtrule.h	8.69 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 edits.h	20.74 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 enumset.h	2.08 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 errorcode.h	4.84 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 fieldpos.h	8.7 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 filteredbrk.h	5.37 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 fmtable.h	24.43 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 format.h	12.5 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 formattedvalue.h	9.75 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 fpositer.h	3.03 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 gender.h	3.33 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 gregocal.h	31.88 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 icudataver.h	1.02 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 icuplug.h	11.83 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 idna.h	12.7 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 listformatter.h	8.79 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 localebuilder.h	11.08 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 localematcher.h	26.84 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 localpointer.h	19.36 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 locdspnm.h	7.12 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 locid.h	47.66 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 measfmt.h	11.42 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 measunit.h	104.97 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 measure.h	4.33 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 messagepattern.h	33.71 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 msgfmt.h	44.22 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 normalizer2.h	33.66 KB	12/01/2022 11:12:32 AM	rw-r--r--
📄 normlzr.h	30.95 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 nounit.h	2.25 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 numberformatter.h	94.15 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 numberrangeformatter.h	25.19 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 numfmt.h	49.84 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 numsys.h	7.33 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 parseerr.h	3.08 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 parsepos.h	5.57 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 platform.h	28.09 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 plurfmt.h	25.24 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 plurrule.h	20.82 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ptypes.h	3.49 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 putil.h	6.32 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 rbbi.h	28.64 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 rbnf.h	48.85 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 rbtz.h	15.77 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 regex.h	84.36 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 region.h	9.18 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 reldatefmt.h	22.22 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 rep.h	9.37 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 resbund.h	18.08 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 schriter.h	6.36 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 scientificnumberformatter.h	6.43 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 search.h	22.22 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 selfmt.h	14.34 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 simpleformatter.h	12.59 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 simpletz.h	45.64 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 smpdtfmt.h	71.07 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 sortkey.h	11.18 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 std_string.h	1.05 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 strenum.h	9.92 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 stringoptions.h	5.79 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 stringpiece.h	10.05 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 stringtriebuilder.h	15.47 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 stsearch.h	21.41 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 symtable.h	4.27 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tblcoll.h	36.92 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 timezone.h	43.81 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tmunit.h	3.4 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tmutamt.h	4.91 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tmutfmt.h	7.42 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 translit.h	65.82 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tzfmt.h	42.93 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tznames.h	16.85 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tzrule.h	35.6 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 tztrans.h	6.13 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ubidi.h	89.61 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ubiditransform.h	12.7 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ubrk.h	24.43 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucal.h	60.68 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucasemap.h	15.21 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucat.h	5.35 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uchar.h	144.64 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucharstrie.h	22.53 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucharstriebuilder.h	7.47 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uchriter.h	13.42 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uclean.h	11.2 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucnv.h	83.46 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucnv_cb.h	6.58 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucnv_err.h	20.98 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucnvsel.h	6.19 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucol.h	61.95 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucoleitr.h	9.82 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uconfig.h	12.07 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucpmap.h	5.53 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucptrie.h	22.5 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucsdet.h	14.69 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ucurr.h	16.72 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 udat.h	62.4 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 udata.h	15.63 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 udateintervalformat.h	11.93 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 udatpg.h	30.18 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 udisplaycontext.h	5.94 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uenum.h	7.79 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ufieldpositer.h	4.41 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uformattable.h	10.97 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uformattedvalue.h	12.3 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ugender.h	2.06 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uidna.h	33.43 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uiter.h	22.75 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uldnames.h	10.48 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ulistformatter.h	10.78 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uloc.h	54.63 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ulocdata.h	11.3 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 umachine.h	16.05 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 umisc.h	1.33 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 umsg.h	24.25 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 umutablecptrie.h	8.29 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unifilt.h	4 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unifunct.h	4.05 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unimatch.h	6.1 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unirepl.h	3.38 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uniset.h	66.46 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unistr.h	170.53 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unorm.h	20.55 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unorm2.h	24.68 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unounclass.h	735 bytes	12/01/2022 11:12:33 AM	rw-r--r--
📄 unum.h	55.31 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unumberformatter.h	30.28 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unumberrangeformatter.h	15.37 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 unumsys.h	7.26 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uobject.h	10.68 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 upluralrules.h	8.79 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uregex.h	71.99 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uregion.h	9.81 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ureldatefmt.h	17.04 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 urename.h	135 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 urep.h	5.38 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ures.h	36.54 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uscript.h	27.63 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 usearch.h	39.21 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uset.h	44.29 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 usetiter.h	9.68 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ushape.h	18 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uspoof.h	65.84 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 usprep.h	8.19 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ustdio.h	38.56 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ustream.h	1.89 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ustring.h	72.36 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 ustringtrie.h	3.15 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utext.h	58.08 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utf.h	7.87 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utf16.h	23.35 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utf32.h	763 bytes	12/01/2022 11:12:33 AM	rw-r--r--
📄 utf8.h	30.83 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utf_old.h	45.83 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utmscale.h	13.78 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utrace.h	17.18 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utrans.h	25.54 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 utypes.h	31.06 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uvernum.h	6.68 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 uversion.h	5.99 KB	12/01/2022 11:12:33 AM	rw-r--r--
📄 vtzone.h	20.74 KB	12/01/2022 11:12:33 AM	rw-r--r--

Editing: utmscale.h

// © 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_CAPI 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_CAPI 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_CAPI int64_t U_EXPORT2
    utmscale_toInt64(int64_t universalTime, UDateTimeScale timeScale, UErrorCode *status);

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif