iOS-时间与日期详解http://www.jianshu.com/p/f8aab37a27ff
https://github.com/MatthewYork/DateTools
iOS日历、日期、时间的计算http://www.jianshu.com/p/692bb0a7269c
iOS开发tips之日期与星期的对应http://www.jianshu.com/p/804d22fd5180
判断NSDate是星期几和农历http://www.jianshu.com/p/5850a5d03b8f
NSDate的8小时问题：初始化一个NSDate时间[NSDate date]，获取的是零时区的时间（格林尼治的时间: 年-月-日 时:分:秒: +时区），而北京时间是东八区时间，因为时区不同，所以打印的时间相差了8小时。
NSDate *date = [NSDate date];
NSLog(@"date时间 = %@", date);
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
NSString *dateStr = [formatter stringFromDate:date];
NSLog(@"字符串时间 = %@", dateStr);
2016-12-07 10:44:24.470 timeTest[32743:2995134] date时间 = 2016-12-07 02:44:24 +0000
2016-12-07 10:44:24.471 timeTest[32743:2995134] 字符串时间 = 2016-12-07 10:44:24 +0800
也可以设置时区，获取指定时区的字符串时间
NSDate *date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
formatter.timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];//东八区时间
NSString *dateStr = [formatter stringFromDate:date];
NSLog(@"字符串时间 = %@", dateStr);
TimeToolsManger
#import
#define DEFAULT_DATE_TEMPLATE_STRING @"yyyy-MM-dd HH:mm:ss"
#define DEFAULT_SHORT_DATE_TEMPLATE_STRING @"yyyy-MM-dd HH:mm"
#define SHORT_DATE_TEMPLATE_STRING @"yyyy-MM-dd"
#define HOUR_MINUT_TEMPLATE_STRING @"HH:mm"
#define DETAIL_DATE_TEMPLATE_STRING @"yyyy年MM月dd日"
#define MONTH_DATE_TEMPLATE_STRING @"yyyy-MM"
@interface TimeToolsManger : NSObject
/**
* 获取单例对象
*/
+ (instancetype)shareToolsManager;
///日期格式转字符串
+ (NSString *)dateToString:(NSDate *)date withDateFormat:(NSString *)format;
///字符串转日期格式
+ (NSDate *)stringToDate:(NSString *)dateString withDateFormat:(NSString *)format;
///根据时间取得今天是星期几
+ (NSString*)weekdayStringFromDate:(NSDate*)inputDate ;
///根据当前时间获取下一个月的今天
+(NSString*)getNextMonth:(NSUInteger)number;
///根据当前时间获取上一个月的今天
+(NSString*)getLastMonth:(NSUInteger)number;
///以秒为整数值 时间戳->字符串
+ (NSString *)timeWithTimeIntervalString:(NSString *)timeString;
///以秒为整数值 获取当前时间戳
+ (NSString *)dateTimeIntervalString;
///聊天界面通过时间戳得到标准格式的字符串
+(NSString *)getMessageDateStringFromTimeInterval:(NSTimeInterval)TimeInterval andNeedTime:(BOOL)needTime;
+ (NSString*)getMessageDateString:(NSDate*)messageDate andNeedTime:(BOOL)needTime;
+(NSString *)getWeekdayWithNumber:(NSInteger)number;
///计算距离当前时间天数
+(NSString*)residueDays:(NSString*)dateString;
///计算距离未来时间天数
+(NSString*)futureDays:(NSString*)dateString;
@end
//
// TimeToolsManger.m
// test123
//
// Created by 29 on 16/12/13.
// Copyright © 2016年 aiitex. All rights reserved.
//
#import "TimeToolsManger.h"
@implementation TimeToolsManger
+ (instancetype)shareToolsManager {
static TimeToolsManger *manager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manager = [[TimeToolsManger alloc] init];
});
return manager;
}
///根据时间取得今天是星期几
+ (NSString*)weekdayStringFromDate:(NSDate*)inputDate {
NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"周日", @"周一", @"周二", @"周三", @"周四", @"周五", @"周六", nil];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];
[calendar setTimeZone: timeZone];
NSCalendarUnit calendarUnit = NSCalendarUnitWeekday;
NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];
return [weekdays objectAtIndex:theComponents.weekday];
}
///根据当前时间获取下一个月的今天
+(NSString*)getNextMonth:(NSUInteger)number{
NSDate * mydate = [NSDate date];
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = nil;
comps = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitMonth fromDate:mydate];
NSDateComponents *adcomps = [[NSDateComponents alloc] init];
[adcomps setYear:0];
[adcomps setMonth:number];
[adcomps setDay:0];
NSDate *newdate = [calendar dateByAddingComponents:adcomps toDate:mydate options:0];
NSString *beforDate = [dateFormatter stringFromDate:newdate];
return beforDate;
}
///根据当前时间获取上一个月的今天
+(NSString*)getLastMonth:(NSUInteger)number{
NSDate * mydate = [NSDate date];
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = nil;
comps = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitMonth fromDate:mydate];
NSDateComponents *adcomps = [[NSDateComponents alloc] init];
[adcomps setYear:0];
[adcomps setMonth:-number];
[adcomps setDay:0];
NSDate *newdate = [calendar dateByAddingComponents:adcomps toDate:mydate options:0];
NSString *beforDate = [dateFormatter stringFromDate:newdate];
return beforDate;
}
///日期格式转字符串
+ (NSString *)dateToString:(NSDate *)date withDateFormat:(NSString *)format
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:format];
NSString *strDate = [dateFormatter stringFromDate:date];
return strDate;
}
///字符串转日期格式
+ (NSDate *)stringToDate:(NSString *)dateString withDateFormat:(NSString *)format
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:format];
NSDate *date = [dateFormatter dateFromString:dateString];
///将世界时间转化为中国区时间
NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
NSInteger interval = [timeZone secondsFromGMTForDate:date];
NSDate *localeDate = [date dateByAddingTimeInterval:interval];
return localeDate;
}
///以秒为整数值的时间戳转换
+ (NSString *)timeWithTimeIntervalString:(NSString *)timeString
{
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
formatter.timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"yyyy年MM月dd日 HH:mm:ss"];
NSDate* date = [NSDate dateWithTimeIntervalSince1970:[timeString doubleValue]];
NSString* dateString = [formatter stringFromDate:date];
return dateString;
}
///以秒为整数值 获取当前时间戳
+ (NSString *)dateTimeIntervalString{
NSDate* date = [NSDate dateWithTimeIntervalSinceNow:0];
NSTimeInterval a=[date timeIntervalSince1970]; // *1000 是精确到毫秒，不乘就是精确到秒
NSString *timeString = [NSString stringWithFormat:@"%.0f", a]; //转为字符型
return timeString;
}
///聊天界面通过时间戳得到标准格式的字符串
+(NSString *)getMessageDateStringFromTimeInterval:(NSTimeInterval)TimeInterval andNeedTime:(BOOL)needTime
{
NSDate *date = [NSDate dateWithTimeIntervalSince1970:TimeInterval];
return [TimeToolsManger getMessageDateString:date andNeedTime:needTime];
}
+ (NSString*)getMessageDateString:(NSDate*)messageDate andNeedTime:(BOOL)needTime
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[NSLocale systemLocale]];
[formatter setTimeZone:[NSTimeZone systemTimeZone]];
[formatter setDateFormat:@"YYYY/MM/dd HH:mm"];
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday fromDate:messageDate];
NSDate *msgDate = [cal dateFromComponents:components];
NSString*weekday = [TimeToolsManger getWeekdayWithNumber:components.weekday];
components = [cal components:NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday fromDate:[NSDate date]];
NSDate *today = [cal dateFromComponents:components];
if([today isEqualToDate:msgDate]){
if (needTime) {
[formatter setDateFormat:@"今天 HH:mm"];
}
else{
[formatter setDateFormat:@"今天"];
}
return [formatter stringFromDate:messageDate];
}
components.day -= 1;
NSDate *yestoday = [cal dateFromComponents:components];
if([yestoday isEqualToDate:msgDate]){
if (needTime) {
[formatter setDateFormat:@"昨天 HH:mm"];
}
else{
[formatter setDateFormat:@"昨天"];
}
return [formatter stringFromDate:messageDate];
}
for (int i = 1; i <= 6; i++) {
components.day -= 1;
NSDate *nowdate = [cal dateFromComponents:components];
if([nowdate isEqualToDate:msgDate]){
if (needTime) {
[formatter setDateFormat:[NSString stringWithFormat:@"%@ HH:mm",weekday]];
}
else{
[formatter setDateFormat:[NSString stringWithFormat:@"%@",weekday]];
}
return [formatter stringFromDate:messageDate];
}
}
while (1) {
components.day -= 1;
NSDate *nowdate = [cal dateFromComponents:components];
if ([nowdate isEqualToDate:msgDate]) {
if (!needTime) {
[formatter setDateFormat:@"YYYY/MM/dd"];
}
return [formatter stringFromDate:messageDate];
break;
}
}
}
//1代表星期日、如此类推
+(NSString *)getWeekdayWithNumber:(NSInteger)number
{
switch (number) {
case 1:
return @"星期日";
break;
case 2:
return @"星期一";
break;
case 3:
return @"星期二";
break;
case 4:
return @"星期三";
break;
case 5:
return @"星期四";
break;
case 6:
return @"星期五";
break;
case 7:
return @"星期六";
break;
default:
return @"";
break;
}
}
///计算距离当前时间天数
+(NSString*)residueDays:(NSString*)dateString{
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSDate *date1 = [dateFormatter dateFromString:dateString];
NSDate *date = [dateFormatter dateFromString:[TimeToolsManger dateToString:[NSDate date] withDateFormat:@"yyyy-MM-dd"]];
NSTimeInterval time = [date timeIntervalSinceDate:date1];
int days = ((int)time)/(3600*24);
NSString *dateContent = [[NSString alloc] initWithFormat:@"%i",days];
return dateContent;
}
///计算距离未来时间天数
+(NSString*)futureDays:(NSString*)dateString{
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSDate *date1 = [dateFormatter dateFromString:dateString];
NSDate *date = [dateFormatter dateFromString:[TimeToolsManger dateToString:[NSDate date] withDateFormat:@"yyyy-MM-dd"]];
NSTimeInterval time = [date1 timeIntervalSinceDate:date];
int days = ((int)time)/(3600*24);
NSString *dateContent = [[NSString alloc] initWithFormat:@"%i",days];
return dateContent;
}
@end