iOS 时间和时间戳相互转化

1:获取当前系统时间的时间戳

#pragma mark - 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"]; // ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

//设置时区,这个对于时间的处理有时很重要

NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate *datenow = [NSDate date];//现在时间

NSLog(@"设备当前的时间:%@",[formatter stringFromDate:datenow]);

//时间转时间戳的方法:

NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];

NSLog(@"设备当前的时间戳:%ld",(long)timeSp); //时间戳的值

return timeSp;

}

2:将某个时间转化成 时间戳

#pragma mark - 将某个时间转化成 时间戳

+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate* date = [formatter dateFromString:formatTime]; //------------将字符串按formatter转成nsdate

//时间转时间戳的方法:

NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];

NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp); //时间戳的值

return timeSp;

}

3:将某个时间戳转化成 时间

#pragma mark - 将某个时间戳转化成 时间

+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:format]; // （@"YYYY-MM-dd hh:mm:ss"）----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

[formatter setTimeZone:timeZone];

NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];

NSLog(@"1296035591  = %@",confromTimesp);

NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];

//NSLog(@"&&&&&&&confromTimespStr = : %@",confromTimespStr);

return confromTimespStr;

}

4:根据时间判断周几

+ (NSString*)weekdayStringFromDate:(NSDate*)inputDate {

NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"周天", @"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];

}