项目最近用到一些关于 NSDate 的相关知识，特此记录。需要用的朋友可以创建一个类目，把需要用到的方法复制过去就行。
目录
1.是否为今天
2.是否为昨天
3.根据时间戳获取时间
4.根据时间获取时间戳
5.获取当前时间的时间戳
6.计算两个日期间隔天数
7.获取当前是星期几
8.获取当前是几月几日
9.计算时间差
10.字符串转日期格式
11.将世界时间转化为中国区时间
// 是否为今天
- (BOOL)isToday{
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:[NSDate date]];
NSDate *today = [cal dateFromComponents:components];
components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:self];
NSDate *otherDate = [cal dateFromComponents:components];
if([today isEqualToDate:otherDate]){
return YES;
}
return NO;
}
// 是否为昨天
- (BOOL)isYesterday{
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:[NSDate date]];
NSDate *today = [cal dateFromComponents:components];
NSDate *yesterday = [today dateByAddingTimeInterval: -kDayTimeInterval];
components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:self];
NSDate *otherDate = [cal dateFromComponents:components];
if([yesterday isEqualToDate:otherDate]){
return YES;
}
return NO;
}
// 根据时间戳获取时间
+ (NSString *)timeWithTimeStampString:(NSString *)timeStamp{
// 格式化时间
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
formatter.timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"yyyy-MM-dd"];
// 毫秒值转化为秒
NSDate* date = [NSDate dateWithTimeIntervalSince1970:[timeStamp doubleValue]/ 1000.0];
NSString* dateString = [formatter stringFromDate:date];
return dateString;
}
// 根据时间获取时间戳
+ (NSString *)timeStampWithDade:(NSDate *)date{
NSTimeInterval a=[date timeIntervalSince1970]*1000; // *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;
}
// 获取当前时间的时间戳
+ (NSInteger)getNowTimestamp{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; //
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setTimeZone:timeZone];
NSDate *datenow = [NSDate date];//现在时间
//时间转时间戳的方法:
NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];
return timeSp;
}
// 计算两个日期间隔天数
+ (NSInteger)getDaysFrom:(NSString *)beginDate To:(NSString *)endDate{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd";
// 将字符串日期 转换为 NSDate 类型,并去掉时分秒信息
NSDate *fromDate = [NSDate worldTimeToChina:[formatter dateFromString:[beginDate substringToIndex:10]]];
NSDate *toDate = [NSDate worldTimeToChina:[formatter dateFromString:[endDate substringToIndex:10]]];
NSTimeInterval time = [toDate timeIntervalSinceDate:fromDate];
NSInteger days = ((int)time) / (3600 * 24);
return days;
}
// 获取当前是星期几
+ (NSInteger)getNowWeekday {
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday |
NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDate *now = [NSDate date];
// 在真机上需要设置区域，才能正确获取本地日期，中国区代码：zh_CN
calendar.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
comps = [calendar components:unitFlags fromDate:now];
return [comps weekday];
}
// 获取当前是几月几日
+ (NSString *)getTodayStr{
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:[NSDate date]];
NSDate *today = [cal dateFromComponents:components];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"MM月dd日";
return [formatter stringFromDate:today];
}
// 计算时间差
+ (NSTimeInterval)timeInterValWithDate:(NSString *)featureDate{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
// 设置日期格式，可以根据自己的需求随时调整，否则计算的结果为 nil
formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
// 将字符串日期 转换为 NSDate 类型
NSDate *endDate = [formatter dateFromString:featureDate];
return [endDate timeIntervalSinceDate:[NSDate new]];
}
// 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];
return date;
}
// 将世界时间转化为中国区时间
+ (NSDate *)worldTimeToChina:(NSDate *)date{
NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
NSInteger interval = [timeZone secondsFromGMTForDate:date];
NSDate *localeDate = [date dateByAddingTimeInterval:interval];
return localeDate;
}
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