項(xiàng)目最近用到一些關(guān)于 NSDate 的相關(guān)知識(shí)殿遂，特此記錄竟闪。需要用的朋友可以創(chuàng)建一個(gè)類目爽冕，把需要用到的方法復(fù)制過去就行隙赁。
目錄
1.是否為今天
2.是否為昨天
3.根據(jù)時(shí)間戳獲取時(shí)間
4.根據(jù)時(shí)間獲取時(shí)間戳
5.獲取當(dāng)前時(shí)間的時(shí)間戳
6.計(jì)算兩個(gè)日期間隔天數(shù)
7.獲取當(dāng)前是星期幾
8.獲取當(dāng)前是幾月幾日
9.計(jì)算時(shí)間差
10.字符串轉(zhuǎn)日期格式
11.將世界時(shí)間轉(zhuǎn)化為中國區(qū)時(shí)間
// 是否為今天
- (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;
}
// 是否為昨天
- (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;
}
// 根據(jù)時(shí)間戳獲取時(shí)間
+ (NSString *)timeWithTimeStampString:(NSString *)timeStamp{
// 格式化時(shí)間
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
formatter.timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"yyyy-MM-dd"];
// 毫秒值轉(zhuǎn)化為秒
NSDate* date = [NSDate dateWithTimeIntervalSince1970:[timeStamp doubleValue]/ 1000.0];
NSString* dateString = [formatter stringFromDate:date];
return dateString;
}
// 根據(jù)時(shí)間獲取時(shí)間戳
+ (NSString *)timeStampWithDade:(NSDate *)date{
NSTimeInterval a=[date timeIntervalSince1970]*1000; // *1000 是精確到毫秒垦藏，不乘就是精確到秒
NSString *timeString = [NSString stringWithFormat:@"%.0f", a]; //轉(zhuǎn)為字符型
return timeString;
}
// 獲取當(dāng)前時(shí)間的時(shí)間戳
+ (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];//現(xiàn)在時(shí)間
//時(shí)間轉(zhuǎn)時(shí)間戳的方法:
NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];
return timeSp;
}
// 計(jì)算兩個(gè)日期間隔天數(shù)
+ (NSInteger)getDaysFrom:(NSString *)beginDate To:(NSString *)endDate{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd";
// 將字符串日期 轉(zhuǎn)換為 NSDate 類型,并去掉時(shí)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;
}
// 獲取當(dāng)前是星期幾
+ (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];
// 在真機(jī)上需要設(shè)置區(qū)域，才能正確獲取本地日期伞访，中國區(qū)代碼：zh_CN
calendar.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
comps = [calendar components:unitFlags fromDate:now];
return [comps weekday];
}
// 獲取當(dāng)前是幾月幾日
+ (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];
}
// 計(jì)算時(shí)間差
+ (NSTimeInterval)timeInterValWithDate:(NSString *)featureDate{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
// 設(shè)置日期格式掂骏，可以根據(jù)自己的需求隨時(shí)調(diào)整，否則計(jì)算的結(jié)果為 nil
formatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];
formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
// 將字符串日期 轉(zhuǎn)換為 NSDate 類型
NSDate *endDate = [formatter dateFromString:featureDate];
return [endDate timeIntervalSinceDate:[NSDate new]];
}
// 字符串轉(zhuǎn)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;
}
// 將世界時(shí)間轉(zhuǎn)化為中國區(qū)時(shí)間
+ (NSDate *)worldTimeToChina:(NSDate *)date{
NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
NSInteger interval = [timeZone secondsFromGMTForDate:date];
NSDate *localeDate = [date dateByAddingTimeInterval:interval];
return localeDate;
}
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