Java获取当地的日出日落时间代码分享
根据经纬度和当前日期获取当地的日出日落时间，强大的Google搜索让我迅速找到了一个外国人写的一个java类，代码中的注释写得很清楚。
这里直接贴出代码来：
/****************************************************************************** * * SunriseSunset.java * ******************************************************************************* * *JavaClass:SunriseSunset * * ThisJavaclassispartofacollectionofclassesdevelopedforthe * readingandprocessingofoceanographicandmeterologicaldatacollected * since1970byenvironmentalbuoysandstations. Thisdatasetis * maintainedbytheNationalOceanographicDataCenterandispublicly * available. TheseJavaclasseswerewrittenfortheUSEnvironmental * ProtectionAgency'sNationalExposureResearchLaboratoryunderContract * No.GS-10F-0073KwithNeptuneandCompanyofLosAlamos,NewMexico. * *Purpose: * * ThisJavaclassperformscalculationstodeterminethetimeof * sunriseandsunsetgivenlat,long,anddate. * *Inputs: * * Latitude,longitude,date/time,andtimezone. * *Outputs: * * Localtimeofsunriseandsunsetascalculatedbythe * program. * Ifnosunriseornosunsetoccurs,orifthesunisupallday * ordownallday,appropriatebooleanvaluesareset. * Abooleanisprovidedtoidentifyifthetimeprovidedisduringtheday. * * Theabovevaluesareaccessedbythefollowingmethods: * * Date getSunrise() returnsdate/timeofsunrise * Date getSunset() returnsdate/timeofsunset * boolean isSunrise() returnstrueiftherewasasunrise,elsefalse * boolean isSunset() returnstrueiftherewasasunset,elsefalse * boolean isSunUp() returnstrueifsunisupallday,elsefalse * boolean isSunDown() returnstrueifsunisdownallday,elsefalse * boolean isDaytime() returnstrueifsunisupatthetime * specified,elsefalse * *RequiredclassesfromtheJavalibrary: * * java.util.Date * java.text.SimpleDateFormat * java.text.ParseException; * java.math.BigDecimal; * *Packageofwhichthisclassisamember: * * default * *Knownlimitations: * * Itisassumedthatthedataprovidedarewithinvalieranges * (i.e.latitudebetween-90and+90,longitudebetween0and360, * avaliddate,andtimezonebetween-14and+14. * *Compatibility: * * Java1.1.8 * *References: * * Themathematicalalgorithmsusedinthisprogramarepatterned * afterthosedebvelopedbyRogerSinnottinhisBASICprogram, * SUNUP.BAS,publishedinSky&Telescopemagazine: * Sinnott,RogerW."SunriseandSunset:AChallenge" * Sky&Telescope,August,1994p.84-85 * * Thefollowingisacross-indexofvariablesusedinSUNUP.BAS. * Asingledefinitionfrommultiplereuseofvariablenamesin * SUNUP.BASwasclarifiedwithvariousdefinitionsinthisprogram. * * SUNUP.BAS thisclass * * A dfA * A(2) dfAA1,dfAA2 * A0 dfA0 * A2 dfA2 * A5 dfA5 * AZ Notused * C dfCosLat * C0 dfC0 * D iDay * D(2) dfDD1,dfDD2 * D0 dfD0 * D1 dfD1 * D2 dfD2 * D5 dfD5 * D7 Notused * DA dfDA * DD dfDD * G bGregorian,dfGG * H dfTimeZone * H0 dfH0 * H1 dfH1 * H2 dfH2 * H3 dfHourRise,dfHourSet * H7 Notused * J dfJ * J3 dfJ3 * K1 dfK1 * L dfLL * L0 dfL0 * L2 dfL2 * L5 dfLon * M iMonth * M3 dfMinRise,dfMinSet * N7 Notused * P dfP * S iSign,dfSinLat,dfSS * T dfT * T0 dfT0 * T3 notused * TT dfTT * U dfUU * V dfVV * V0 dfV0 * V1 dfV1 * V2 dfV2 * W dfWW * Y iYear * Z dfZenith * Z0 dfTimeZone * * *Author/Company: * * JDT:JohnTauxe,NeptuneandCompany * JMG:JoMarieGreen * *Changelog: * * date ver by descriptionofchange * _________ _____ ___ ______________________________________________ * 5Jan01 0.006 JDT Excisedfromssapp.javav.0.005. * 11Jan01 0.007 JDT Minormodificationstocommentsbasedon * materialfromSinnott,1994. * 7Feb01 0.008 JDT Fixedbackwardstimezone. Thestandardisthat * localtimezoneisspecifiedinhoursEASTof * Greenwich,sothatESTwouldbe-5,forexample. * Forsomereason,SUNUP.BASdoesthisbackwards * (probablyanamericocentricperspective)and * SunriseSunsetadoptedthatconvention. Oops. * Sothesigninthemathischanged. * 7Feb01 0.009 JDT Well,thatthrewofftheazimuthcalculation... * Removedtheazimuthcalculations. * 14Feb01 0.010 JDT Addedabilitytoacceptatime(HH:mm)in * dateInput,anddecideifthattimeisdaytime * ornighttime. * 27Feb01 0.011 JDT Addedaccessormethodsinplaceofhavingpublic * variablestogetresults. * 28Feb01 0.012 JDT Cleaneduplistofimportedclasses. * 28Mar01 1.10 JDT Finalversionaccompanyingdeliverable1b. * 4Apr01 1.11 JDT Movedlogicsupporting.isDaytimeintomethod. * Movedcalculationsoutofconstructor. * 01May01 1.12 JMG Added'GMT'designationandtestinglines. * 16May01 1.13 JDT AddedsetLenient(false)andsetTimeZone(tz) * todfmtDay,dfmtMonth,anddfmtYearin * doCalculations. * 27Jun01 1.14 JDT RemovedrelianceonStationConstants(GMT). * 13Aug01 1.20 JDT Finalversionaccompanyingdeliverable1c. * 6Sep01 1.21 JDT Thoroughcodeandcommentreview. * 21Sep01 1.30 JDT Finalversionaccompanyingdeliverable2. * 17Dec01 1.40 JDT Versionaccompanyingfinaldeliverable. * *----------------------------------------------------------------------------*/
//Importrequiredclassesandpackages importjava.util.Date; importjava.text.SimpleDateFormat; importjava.text.ParseException; importjava.math.BigDecimal; importjava.util.TimeZone;
/****************************************************************************** * class: SunriseSunsetclass ******************************************************************************* * * ThisJavaclassperformscalculationstodeterminethetimeof * sunriseandsunsetgivenlat,long,anddate. * * Itisassumedthatthedataprovidedarewithinvalieranges * (i.e.latitudebetween-90and+90,longitudebetween0and360, * avaliddate,andtimezonebetween-14and+14. * *----------------------------------------------------------------------------*/ publicclassSunriseSunset { //Declareandinitializevariables privatedouble dfLat; //latitudefromuser privatedouble dfLon; //latitudefromuser privateDate dateInput; //date/timefromuser privatedouble dfTimeZone; //timezonefromuser
privateDate dateSunrise; //dateandtimeofsunrise privateDate dateSunset; //dateandtimeofsunset privateboolean bSunriseToday =false; //flagforsunriseonthisdate privateboolean bSunsetToday =false; //flagforsunsetonthisdate privateboolean bSunUpAllDay =false; //flagforsunupallday privateboolean bSunDownAllDay=false; //flagforsundownallday privateboolean bDaytime =false; //flagfordaytime,given //hourandminindateInput privateboolean bSunrise=false; //sunriseduringhourchecked privateboolean bSunset =false; //sunsetduringhourchecked privateboolean bGregorian=false; //flagforGregoriancalendar privateint iJulian; //Julianday private int iYear; //yearofdateofinterest private int iMonth; //monthofdateofinterest private int iDay; //dayofdateofinterest private int iCount; //asimplecounter private int iSign; //SUNUP.BAS:S privatedouble dfHourRise,dfHourSet; //hourofevent:SUNUP.BASH3 privatedouble dfMinRise,dfMinSet; //minuteofevent:SUNUP.BASM3 private double dfSinLat,dfCosLat; //sinandcosoflatitude private double dfZenith; //SUNUP.BASZ:Zenith private SimpleDateFormatdfmtDate; //formattingfordatealone private SimpleDateFormatdfmtDateTime; //formattingfordateandtime private SimpleDateFormatdfmtYear; //formattingforyear private SimpleDateFormatdfmtMonth; //formattingformonth private SimpleDateFormatdfmtDay; //formattingforday //ManyvariablesinSUNUP.BAShaveundocumentedmeanings, //andsoaretranslatedratherdirectlytoavoidconfusion: private double dfAA1=0,dfAA2=0; //SUNUP.BASA(2) private double dfDD1=0,dfDD2=0; //SUNUP.BASD(2) private double dfC0; //SUNUP.BASC0 private double dfK1; //SUNUP.BASK1 private double dfP; //SUNUP.BASP private double dfJ; //SUNUP.BASJ private double dfJ3; //SUNUP.BASJ3 private double dfA; //SUNUP.BASA private double dfA0,dfA2,dfA5; //SUNUP.BASA0,A2,A5 private double dfD0,dfD1,dfD2,dfD5; //SUNUP.BASD0,D1,D2,D5 private double dfDA,dfDD; //SUNUP.BASDA,DD private double dfH0,dfH1,dfH2; //SUNUP.BASH0,H1,H2 private double dfL0,dfL2; //SUNUP.BASL0,L2 private double dfT,dfT0,dfTT; //SUNUP.BAST,T0,TT private double dfV0,dfV1,dfV2; //SUNUP.BASV0,V1,V2 privateTimeZonetz=TimeZone.getTimeZone("GMT"); /****************************************************************************** * method: SunriseSunset ******************************************************************************* * * ConstructorforSunriseSunsetclass. * *----------------------------------------------------------------------------*/ SunriseSunset( doubledfLatIn, //latitude doubledfLonIn, //longitude Date dateInputIn, //date doubledfTimeZoneIn //timezone ) { //Copyvaluessuppliedasagrumentstolocalvariables. dfLat =dfLatIn; dfLon =dfLonIn; dateInput =dateInputIn; dfTimeZone =dfTimeZoneIn; //Callthemethodtodothecalculations. doCalculations();
}//endofclassconstructor
/****************************************************************************** * method: doCalculations ******************************************************************************* * * MethodforperformingthecalculationsdoneinSUNUP.BAS. * *----------------------------------------------------------------------------*/ privatevoiddoCalculations() { try { //Breakoutday,month,andyearfromdateprovided. //(Thisisnecesaryforthemathalgorithms.)
dfmtYear =newSimpleDateFormat("yyyy"); dfmtYear.setLenient(false); dfmtYear.setTimeZone(tz);
dfmtMonth=newSimpleDateFormat("M"); dfmtMonth.setLenient(false); dfmtMonth.setTimeZone(tz);
dfmtDay =newSimpleDateFormat("d"); dfmtDay.setLenient(false); dfmtDay.setTimeZone(tz); iYear =Integer.parseInt( dfmtYear.format(dateInput)); iMonth=Integer.parseInt(dfmtMonth.format(dateInput)); iDay =Integer.parseInt( dfmtDay.format(dateInput)); //Converttimezonehourstodecimaldays(SUNUP.BASline50) dfTimeZone=dfTimeZone/24.0;
//NOTE:(7Feb2001)Hereisanon-standardpartofSUNUP.BAS: //It(andthisalgorithm)assumesthatthetimezoneis //positivewest,insteadofthestandardnegativewest. //ClassescallingSunriseSunsetwillbeassumingthat //timeszonesarespecifiedinnegativewest,soherethe //signischangedsothattheSUNUPalgorithmworks: dfTimeZone=-dfTimeZone;
//Convertlongitudetofraction(SUNUP.BASline50) dfLon=dfLon/360.0;
//ConvertcalendardatetoJuliandate: //Checktoseeifit'slaterthan1583:Gregoriancalendar //Whendeclared,bGregorianisinitializedtofalse. //**Considermakingaseparateclassofthisfunction.** if(iYear>=1583)bGregorian=true; //SUNUP.BAS1210 dfJ=-Math.floor(7.0 //SUNUPusedINT,notfloor *(Math.floor( (iMonth+9.0) /12.0 )+iYear )/4.0 ) //addSUNUP.BAS1240and1250forG=0 +Math.floor(iMonth*275.0/9.0) +iDay +1721027.0 +iYear*367.0; if(bGregorian) { //SUNUP.BAS1230 if((iMonth-9.0)<0.0)iSign=-1; elseiSign=1; dfA=Math.abs(iMonth-9.0); //SUNUP.BAS1240and1250 dfJ3=-Math.floor( ( Math.floor( Math.floor(iYear +(double)iSign *Math.floor(dfA/7.0) ) /100.0 )+1.0 )*0.75 ); //correctdfJasinSUNUP.BAS1240and1250forG=1 dfJ=dfJ+dfJ3+2.0; } //SUNUP.BAS1290 iJulian=(int)dfJ-1; //SUNUP.BAS60and70(seealsoline1290) dfT=(double)iJulian-2451545.0+0.5; dfTT=dfT/36525.0+1.0; //centuriessince1900 //Calculatelocalsiderealtimeat0hinzonetime //SUNUP.BAS410through460 dfT0=(dfT*8640184.813/36525.0 +24110.5 +dfTimeZone*86636.6 +dfLon*86400.0 ) /86400.0; dfT0=dfT0-Math.floor(dfT0); //NOTE:SUNUP.BASusesINT() dfT0=dfT0*2.0*Math.PI; //SUNUP.BAS90 dfT=dfT+dfTimeZone;
//SUNUP.BAS110:GetSun'sposition for(iCount=0;iCount<=1;iCount++) //Loopthruonlytwice { //CalculateSun'srightascensionanddeclination // atthestartandendofeachday. //SUNUP.BAS910-1160:Fundamentalarguments // fromvanFlandernandPulkkinen,1979 //declarelocaltemporarydoublesforcalculations double dfGG; //SUNUP.BASG double dfLL; //SUNUP.BASL double dfSS; //SUNUP.BASS double dfUU; //SUNUP.BASU double dfVV; //SUNUP.BASV double dfWW; //SUNUP.BASW dfLL=0.779072+0.00273790931*dfT; dfLL=dfLL-Math.floor(dfLL); dfLL=dfLL*2.0*Math.PI; dfGG=0.993126+0.0027377785*dfT; dfGG=dfGG-Math.floor(dfGG); dfGG=dfGG*2.0*Math.PI; dfVV= 0.39785*Math.sin(dfLL) -0.01000*Math.sin(dfLL-dfGG) +0.00333*Math.sin(dfLL+dfGG) -0.00021*Math.sin(dfLL)*dfTT; dfUU=1 -0.03349*Math.cos(dfGG) -0.00014*Math.cos(dfLL*2.0) +0.00008*Math.cos(dfLL); dfWW=-0.00010 -0.04129*Math.sin(dfLL*2.0) +0.03211*Math.sin(dfGG) -0.00104*Math.sin(2.0*dfLL-dfGG) -0.00035*Math.sin(2.0*dfLL+dfGG) -0.00008*Math.sin(dfGG)*dfTT; //ComputeSun'sRAandDec;SUNUP.BAS1120-1140 dfSS=dfWW/Math.sqrt(dfUU-dfVV*dfVV); dfA5=dfLL +Math.atan(dfSS/Math.sqrt(1.0-dfSS*dfSS)); dfSS=dfVV/Math.sqrt(dfUU); dfD5=Math.atan(dfSS/Math.sqrt(1-dfSS*dfSS)); //Setvaluesandincrementt if(iCount==0) //SUNUP.BAS125 { dfAA1=dfA5; dfDD1=dfD5; } else //SUNUP.BAS145 { dfAA2=dfA5; dfDD2=dfD5; } dfT=dfT+1.0; //SUNUP.BAS130 } //endofGetSun'sPositionforloop if(dfAA2<dfAA1)dfAA2=dfAA2+2.0*Math.PI; //SUNUP.BAS150 dfZenith=Math.PI*90.833/180.0; //SUNUP.BAS160 dfSinLat=Math.sin(dfLat*Math.PI/180.0); //SUNUP.BAS170 dfCosLat=Math.cos(dfLat*Math.PI/180.0); //SUNUP.BAS170 dfA0=dfAA1; //SUNUP.BAS190 dfD0=dfDD1; //SUNUP.BAS190 dfDA=dfAA2-dfAA1; //SUNUP.BAS200 dfDD=dfDD2-dfDD1; //SUNUP.BAS200 dfK1=15.0*1.0027379*Math.PI/180.0; //SUNUP.BAS330 //Initializesunriseandsunsettimes,andothervariables //hrandminaresettoimpossibletimestomakeerrorsobvious dfHourRise=99.0; dfMinRise =99.0; dfHourSet =99.0; dfMinSet =99.0; dfV0=0.0; //initializationimpliedbyabsenceinSUNUP.BAS dfV2=0.0; //initializationimpliedbyabsenceinSUNUP.BAS //TesteachhourtoseeiftheSuncrossesthehorizon // andwhichwayitisheading. for(iCount=0;iCount<24;iCount++) //SUNUP.BAS210 { double tempA; //SUNUP.BASA double tempB; //SUNUP.BASB double tempD; //SUNUP.BASD double tempE; //SUNUP.BASE dfC0=(double)iCount; dfP=(dfC0+1.0)/24.0; //SUNUP.BAS220 dfA2=dfAA1+dfP*dfDA; //SUNUP.BAS230 dfD2=dfDD1+dfP*dfDD; //SUNUP.BAS230 dfL0=dfT0+dfC0*dfK1; //SUNUP.BAS500 dfL2=dfL0+dfK1; //SUNUP.BAS500 dfH0=dfL0-dfA0; //SUNUP.BAS510 dfH2=dfL2-dfA2; //SUNUP.BAS510 //hourangleathalfhour dfH1=(dfH2+dfH0)/2.0; //SUNUP.BAS520 //declinationathalfhour dfD1=(dfD2+dfD0)/2.0; //SUNUP.BAS530 //SetvalueofdfV0onlyifthisisthefirsthour, //otherwise,itwillgetsettothelastdfV2(SUNUP.BAS250) if(iCount==0) //SUNUP.BAS550 { dfV0=dfSinLat*Math.sin(dfD0) +dfCosLat*Math.cos(dfD0)*Math.cos(dfH0) -Math.cos(dfZenith); //SUNUP.BAS560 } else dfV0=dfV2; //Thatis,dfV2fromtheprevioushour. dfV2=dfSinLat*Math.sin(dfD2) +dfCosLat*Math.cos(dfD2)*Math.cos(dfH2) -Math.cos(dfZenith); //SUNUP.BAS570 //ifdfV0anddfV2havethesamesign,thenproceedtonexthr if( (dfV0>=0.0&&dfV2>=0.0) //botharepositive || //or (dfV0<0.0&&dfV2<0.0) //botharenegative ) { //Breakiterationandproceedtotestnexthour dfA0=dfA2; //SUNUP.BAS250 dfD0=dfD2; //SUNUP.BAS250 continue; //SUNUP.BAS610 } dfV1=dfSinLat*Math.sin(dfD1) +dfCosLat*Math.cos(dfD1)*Math.cos(dfH1) -Math.cos(dfZenith); //SUNUP.BAS590 tempA=2.0*dfV2-4.0*dfV1+2.0*dfV0; //SUNUP.BAS600 tempB=4.0*dfV1-3.0*dfV0-dfV2; //SUNUP.BAS600 tempD=tempB*tempB-4.0*tempA*dfV0; //SUNUP.BAS610 if(tempD<0.0) { //Breakiterationandproceedtotestnexthour dfA0=dfA2; //SUNUP.BAS250 dfD0=dfD2; //SUNUP.BAS250 continue; //SUNUP.BAS610 } tempD=Math.sqrt(tempD); //SUNUP.BAS620 //Determineoccurenceofsunriseorsunset. //Flagstoidentifyoccurrenceduringthisdayare //bSunriseTodayandbSunsetToday,andareinitializedfalse. //Thesearesettrueonlyifsunriseorsunsetoccurs //atanypointinthehourlyloop.Neversettofalse. //Flagstoidentifyoccurrenceduringthishour: bSunrise=false; //resetbeforetest bSunset =false; //resetbeforetest if(dfV0<0.0&&dfV2>0.0) //sunriseoccursthishour { bSunrise=true; //SUNUP.BAS640 bSunriseToday=true; //sunriseoccurredtoday } if(dfV0>0.0&&dfV2<0.0) //sunsetoccursthishour { bSunset=true; //SUNUP.BAS660 bSunsetToday=true; //sunsetoccurredtoday } tempE=(tempD-tempB)/(2.0*tempA); if(tempE>1.0||tempE<0.0) //SUNUP.BAS670,680 tempE=(-tempD-tempB)/(2.0*tempA); //Setvaluesofhourandminuteofsunsetorsunrise //onlyifsunrise/setoccurredthishour. if(bSunrise) { dfHourRise=Math.floor(dfC0+tempE+1.0/120.0); dfMinRise =Math.floor( (dfC0+tempE+1.0/120.0 -dfHourRise ) *60.0 ); } if(bSunset) { dfHourSet =Math.floor(dfC0+tempE+1.0/120.0); dfMinSet =Math.floor( (dfC0+tempE+1.0/120.0 -dfHourSet ) *60.0 ); } //Changesettingsofvariablesfornextloop dfA0=dfA2; //SUNUP.BAS250 dfD0=dfD2; //SUNUP.BAS250 } //endoflooptestingeachhourforanevent //Afterhavingcheckedallhours,setflagsifnoriseorset //bSunUpAllDayandbSundownAllDayareinitializedasfalse if(!bSunriseToday&&!bSunsetToday) { if(dfV2<0.0) bSunDownAllDay=true; else bSunUpAllDay=true; } //LoaddateSunrisewithdata dfmtDateTime=newSimpleDateFormat("dMyyyyHH:mmz"); if(bSunriseToday) { dateSunrise=dfmtDateTime.parse(iDay +""+iMonth +""+iYear +""+(int)dfHourRise +":"+(int)dfMinRise +"GMT"); } //LoaddateSunsetwithdata if(bSunsetToday) { dateSunset=dfmtDateTime.parse(iDay +""+iMonth +""+iYear +""+(int)dfHourSet +":"+(int)dfMinSet +"GMT"); } }//endoftry
//Catcherrors catch(ParseExceptione) { System.out.println("\nCannotparsedate"); System.out.println(e); System.exit(1); }//endofcatch
} /****************************************************************************** * method: getSunrise() ******************************************************************************* * * Getsthedateandtimeofsunrise. Ifthereisnosunrise,returnsnull. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicDategetSunrise() { if(bSunriseToday) return(dateSunrise); else return(null); }
/****************************************************************************** * method: getSunset() ******************************************************************************* * * Getsthedateandtimeofsunset. Ifthereisnosunset,returnsnull. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicDategetSunset() { if(bSunsetToday) return(dateSunset); else return(null); }
/****************************************************************************** * method: isSunrise() ******************************************************************************* * * Returnsabooleanidentifyingiftherewasasunrise. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicbooleanisSunrise() { return(bSunriseToday); }
/****************************************************************************** * method: isSunset() ******************************************************************************* * * Returnsabooleanidentifyingiftherewasasunset. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicbooleanisSunset() { return(bSunsetToday); }
/****************************************************************************** * method: isSunUp() ******************************************************************************* * * Returnsabooleanidentifyingifthesunisupallday. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicbooleanisSunUp() { return(bSunUpAllDay); }
/****************************************************************************** * method: isSunDown() ******************************************************************************* * * Returnsabooleanidentifyingifthesunisdownallday. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicbooleanisSunDown() { return(bSunDownAllDay); }
/****************************************************************************** * method: isDaytime() ******************************************************************************* * * Returnsabooleanidentifyingifitisdaytimeatthehourcontainedin * theDateobjectpassedtoSunriseSunsetonconstruction. * * MemberofSunriseSunsetclass * *--------------------------------------------------------------------------*/ publicbooleanisDaytime() { //Determineifitisdaytime(atsunriseorlater) // ornighttime(atsunsetorlater)atthelocationofinterest // butexpressedinthetimezonerequested. if(bSunriseToday&&bSunsetToday) //sunriseandsunset { if(dateSunrise.before(dateSunset)) //sunrise<sunset { if( ( dateInput.after(dateSunrise) dateInput.equals(dateSunrise) ) && dateInput.before(dateSunset) ) bDaytime=true; else bDaytime=false; } else //sunrisecomesaftersunset(inoppositetimezones) { if( ( dateInput.after(dateSunrise) dateInput.equals(dateSunrise) ) || //useORratherthanAND dateInput.before(dateSunset) ) bDaytime=true; else bDaytime=false; } } elseif(bSunUpAllDay) //sunisupallday bDaytime=true; elseif(bSunDownAllDay) //sunisdownallday bDaytime=false; elseif(bSunriseToday) //sunrisebutnosunset { if(dateInput.before(dateSunrise)) bDaytime=false; else bDaytime=true; } elseif(bSunsetToday) //sunsetbutnosunrise { if(dateInput.before(dateSunset)) bDaytime=true; else bDaytime=false; } elsebDaytime=false; //thisshouldneverexecute
return(bDaytime); }
}//endofclass
/*----------------------------------------------------------------------------- * endofclass *----------------------------------------------------------------------------*/