/获取年月日对象
+(NSDateComponents *)getDateComponents:(NSDate *)date {
NSCalendar *calendar = [NSCalendar currentCalendar];
// [calendar setFirstWeekday:2]; //设置每周的开始是星期一
// [calendar setMinimumDaysInFirstWeek:7]; //设置一周至少需要几天
return [calendar components:
NSYearCalendarUnit|
NSMonthCalendarUnit|
NSDayCalendarUnit|
NSWeekOfYearCalendarUnit|
NSQuarterCalendarUnit fromDate:date];
}
//获得某年的周数
+(NSInteger)getWeek_AccordingToYear:(NSInteger)year {
NSDateComponents *comps = [DataTimeTool getDateComponents:[DataTimeTool dateFromString:[NSString stringWithFormat:@"%ld-12-31",year] DateFormat:@"yyyy-MM-dd"]];
NSInteger week = [comps weekOfYear];
if (week == 1) {
return 52;
}else {
return week;
}
}
/**
* 获取某年某周的范围日期
*
* @param year 年份
* @param weekofYear year里某个周
*
* @return 时间范围字符串
*/
+(NSString*)getWeekRangeDate_Year:(NSInteger)year WeakOfYear:(NSInteger)weekofYear
{
NSString *weekDate = @"";
NSString *timeAxis = [NSString stringWithFormat:@"%ld-06-01 12:00:00",(long)year];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *date = [dateFormatter dateFromString:timeAxis];
NSCalendar *calendar = [NSCalendar currentCalendar];
/**这两个参数的设置影响着周次的个数和划分*****************/
[calendar setFirstWeekday:2]; //设置每周的开始是星期一
// [calendar setMinimumDaysInFirstWeek:7]; //设置一周至少需要几天
NSDateComponents *comps = [calendar components:(NSCalendarUnitWeekOfYear | NSCalendarUnitWeekday | NSCalendarUnitWeekdayOrdinal | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
fromDate:date];
//时间轴是当前年的第几周
NSInteger todayIsWeek = [comps weekOfYear];
if ([DataTimeTool getWeek_AccordingToYear:year] == 53) {
todayIsWeek +=1;
}
//获取时间轴是星期几 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)
NSInteger todayIsWeekDay = [comps weekday];
// 计算当前日期和这周的星期一和星期天差的天数
//firstDiff 星期一相差天数 、 lastDiff 星期天相差天数
long firstDiff,lastDiff;
if (todayIsWeekDay == 1) {
firstDiff = -6;
lastDiff =0;
}else
{
firstDiff = [calendar firstWeekday] - todayIsWeekDay;
lastDiff =8 - todayIsWeekDay;
}
NSDate *firstDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*firstDiff sinceDate:date];
NSDate *lastDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*lastDiff sinceDate:date];
long weekdifference = weekofYear - todayIsWeek;
firstDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*7*weekdifference sinceDate:firstDayOfWeek];
lastDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*7*weekdifference sinceDate:lastDayOfWeek];
weekDate = [NSString stringWithFormat:@"第%ld周(%@-%@)",weekofYear,[DataTimeTool stringFromDate:firstDayOfWeek DateFormat:@"yyyy年M月d号"],[DataTimeTool stringFromDate:lastDayOfWeek DateFormat:@"yyyy年M月d号"]];
return weekDate;
}
/**************************当前时间********************************/
+(NSDateComponents *)getCurrentDateComponents {
return [DataTimeTool getDateComponents:[NSDate date]];
}
+(NSInteger)getCurrentWeek {
NSInteger week = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"w"] intValue];
return week;
}
+(NSInteger)getCurrentYear{
NSInteger year = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"y"] intValue];
return year;
}
+(NSInteger)getCurrentQuarter{
NSInteger quarter = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"q"] intValue];
return quarter;
}
+(NSInteger)getCurrentMonth{
NSInteger month = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"M"] intValue];
return month;
}
+(NSInteger)getCurrentDay{
NSInteger day = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"d"] intValue];
return day;
}
//NSString转NSDate
+(NSDate *)dateFromString:(NSString *)dateString DateFormat:(NSString *)DateFormat{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:DateFormat];
NSDate *destDate= [dateFormatter dateFromString:dateString];
return destDate;
}
//NSDate转NSString
+(NSString *)stringFromDate:(NSDate *)date DateFormat:(NSString *)DateFormat{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:DateFormat];
NSString *destDateString = [dateFormatter stringFromDate:date];
return destDateString;
}
//时间追加
+(NSString *)dateByAddingTimeInterval:(NSTimeInterval)TimeInterval DataTime:(NSString *)dateStr DateFormat:(NSString *)DateFormat{
NSString *str = nil;
NSDate *date = [self dateFromString:dateStr DateFormat:DateFormat];
NSDate * newDate = [date dateByAddingTimeInterval:TimeInterval];
str = [self stringFromDate:newDate DateFormat:DateFormat];
return str;
}
//日期字符串格式化
+(NSString *)getDataTime:(NSString *)dateStr DateFormat:(NSString *)DateFormat {
return [self getDataTime:dateStr DateFormat:DateFormat oldDateFormat:nil];
}
+(NSString *)getDataTime:(NSString *)dateStr DateFormat:(NSString *)DateFormat oldDateFormat:(NSString *)oldDateFormat{
if (!dateStr || [dateStr isEqualToString:@"—"]) {
return @"—";
}
if ([dateStr isEqualToString:@"0"]) {
return @"0";
}
if ([dateStr rangeOfString:@"+"].location != NSNotFound) {
NSArray *strarray = [dateStr componentsSeparatedByString:@"+"];
dateStr = strarray[0];
}
if ([dateStr rangeOfString:@"."].location != NSNotFound) {
NSArray *strarray = [dateStr componentsSeparatedByString:@"."];
dateStr = strarray[0];
}
if ([dateStr rangeOfString:@"T"].location != NSNotFound) {
dateStr = [dateStr stringByReplacingOccurrencesOfString:@"T" withString:@" "];
}
NSDateFormatter *newDateFormatter = [[NSDateFormatter alloc]init];
[newDateFormatter setDateFormat:DateFormat];
NSDateFormatter *oldDateFormatter = [[NSDateFormatter alloc] init];
if (oldDateFormat) {
[oldDateFormatter setDateFormat:oldDateFormat];
}else {
[oldDateFormatter setDateFormat:[self getFormat:dateStr]];
}
NSDate *date = [oldDateFormatter dateFromString:dateStr];
return [newDateFormatter stringFromDate:date];
}
+(int)getNumberOfCharactersInString:(NSString *)str c:(char)c {
int count = 0;
if ([str rangeOfString:[NSString stringWithFormat:@"%c",c]].location != NSNotFound){
for (int i=0;i
if ([str characterAtIndex:i] == c){
count++;
}
}
}
return count;
}
+(NSString *)getFormat:(NSString *)dateString {
NSString *str = [NSString new];
int size = [self getNumberOfCharactersInString:dateString c:'-'];
if (size == 0){
str = [str stringByAppendingString:@"yyyy"];
}else if (size == 1){
str = [str stringByAppendingString:@"yyyy-MM"];
}else if (size == 2){
str = [str stringByAppendingString:@"yyyy-MM-dd"];
}
size = [self getNumberOfCharactersInString:dateString c:':'];
if (size == 0 && [dateString rangeOfString:@" "].location != NSNotFound){
str = [str stringByAppendingString:@" HH"];
}else if (size == 1){
str = [str stringByAppendingString:@" HH:mm"];
}else if (size == 2){
str = [str stringByAppendingString:@" HH:mm:ss"];
}
return str;
}
/**
* json日期转iOS时间
*
* @param string /Date()
*
* @return
*/
+(NSString *)interceptTimeStampFromStr:(NSString *)string DateFormat:(NSString *)DateFormat{
if (!string || [string length] == 0 ) // 传入时间戳为空 返回
{
return @"—";
}
NSMutableString * mutableStr = [NSMutableString stringWithString:string];
NSString * timeStampString = [NSString string];
// 遍历取出括号内的时间戳
for (int i = 0; i < string.length; i ++) {
NSRange startRang = [mutableStr rangeOfString:@"("];
NSRange endRang = [mutableStr rangeOfString:@")"];
if (startRang.location != NSNotFound) {
// 左边括号位置
NSInteger leftLocation = startRang.location;
// 右边括号距离左边括号的长度
NSInteger rightLocation = endRang.location - startRang.location;
// 截取括号时间戳内容
timeStampString = [mutableStr substringWithRange:NSMakeRange(leftLocation + 1,rightLocation - 1)];
}
}
// 把时间戳转化成时间
NSTimeInterval interval=[timeStampString doubleValue] / 1000.0;
NSDate *date = [NSDate dateWithTimeIntervalSince1970:interval];
NSDateFormatter *objDateformat = [[NSDateFormatter alloc] init];
[objDateformat setDateFormat:DateFormat];//年月日时分秒
NSString * timeStr = [NSString stringWithFormat:@"%@",[objDateformat stringFromDate: date]];
return timeStr;
}
#pragma mark - 算出当前月份有多少天
-(NSUInteger)CalculateTheNumberOfdaysinthecurrentmonth:(NSDate*)date{
NSCalendar*calendar = [NSCalendarcurrentCalendar];
NSRange range = [calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:date];
NSUIntegernumberOfDaysInMonth = range.length;
returnnumberOfDaysInMonth;
}
http://blog.csdn.net/dashenid/article/details/77480248
这个是找的别人写的自定义的日期picherview 一般我们都是 年月日 但是 如果只要年月比如：
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