iOS中NSDate常用转换操作整合

//当前时间格式化, 例:YYYY-MM-dd-EEEE-HH:mm:ss
+ (NSString *)getCurrentDataWithDateFormate:(NSString *)formate
{
NSDate *now = [NSDate date];
return [self dateFormattingWithDate:now toFormate:formate];
}//任意NSDate格式化
+ (NSString *)dateFormattingWithDate:(NSDate *)date toFormate:(NSString *)formate
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:formate];
return [formatter stringFromDate:date];
}//获取当天0点时间
+ (NSDate *)returnToDay0Clock
{
NSDate *now = [NSDate date];
NSCalendar *calender = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDateComponents *dateComponent = [calender components:unitFlags fromDate:now];
int hour = (int)[dateComponent hour];
int minute = (int)[dateComponent minute];
int second = (int)[dateComponent second];
//当前时分秒:hour,minute,second
//返回当前时间(hour * 3600 + minute * 60 + second)之前的时间,即为今天凌晨0点
NSDate *nowDay = [NSDate dateWithTimeIntervalSinceNow: - (hour * + minute * + second)];
long long inter = [nowDay timeIntervalSince1970] * ;
NSDate *newDate = [NSDate dateWithTimeIntervalSince1970:inter / ];
return newDate;
}//获取当天24点时间
+ (NSDate *)returnToDay24Clock
{
NSDate *now = [NSDate date];
NSCalendar *calender = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDateComponents *dateComponent = [calender components:unitFlags fromDate:now];
int hour = (int)[dateComponent hour];
int minute = (int)[dateComponent minute];
int second = (int)[dateComponent second];
//一天是60分钟 * 60秒 * 24小时 = 86400秒
NSDate *nextDay = [NSDate dateWithTimeIntervalSinceNow: - (hour * + minute * + second) + ];
return nextDay;
}//获取当前秒数
+ (long long)getCurrentDateSecond
{
return [[NSDate date] timeIntervalSince1970];
}//NSDate转秒
+ (long long)dateTosecond:(NSDate *)date
{
return [date timeIntervalSince1970];
}//秒转NSDate
+ (NSDate *)secondToDate:(long long)second
{
return [NSDate dateWithTimeIntervalSince1970:second];
}//是否是12小时制; YES:12小时制 / NO:24小时制
+ (BOOL)is12HourSystem
{
NSString *formatStringForHour = [NSDateFormatter dateFormatFromTemplate:@"j" options: locale:[NSLocale autoupdatingCurrentLocale]];
NSRange contains = [formatStringForHour rangeOfString:@"a"];
BOOL is12HourSystem = contains.location != NSNotFound;
return is12HourSystem;
}//朋友圈/聊天 时间显示样式
+ (NSString *)dateDisplayResult:(long long)secondCount
{
NSDate *date = [self secondToDate:secondCount];
NSCalendar *calender = [NSCalendar currentCalendar];
//判断是否是今天
if ([calender isDateInToday:date]) { long long dateSecondCount = [[NSDate date] timeIntervalSinceDate:date];
if (dateSecondCount < ) {
return @"刚刚";
}
if (dateSecondCount < ( * )) {
return [NSString stringWithFormat:@"%d分钟前",(int)(dateSecondCount / )];
}
return [NSString stringWithFormat:@"%d小时前",(int)(dateSecondCount / ( * ))];
} //判断是否是昨天
NSString *formatterString = @" HH:mm";
if ([calender isDateInYesterday:date]) {
formatterString = [@"昨天" stringByAppendingString:formatterString];
} else {
//判断是否是一年内
formatterString = [@"MM-dd" stringByAppendingString:formatterString];
//判断是否值一年之前
NSDateComponents *component = [calender components:NSCalendarUnitYear fromDate:date toDate:[NSDate date] options:NSCalendarWrapComponents]; if (component.year >= ) {
formatterString = [@"YYYY-" stringByAppendingString:formatterString];
}
}
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:formatterString];
formatter.locale = [NSLocale localeWithLocaleIdentifier:@"en"];
return [formatter stringFromDate:date];
}//比较两个NsDate对象的时间差
+ (CompareResult *)compareDateDifferenceDate1:(NSDate *)date1 date2:(NSDate *)date2
{
CompareResult *result = [[CompareResult alloc] init];
result.value = (fabs([date1 timeIntervalSinceDate:date2]));
result.trend = [date1 compare:date2];
return result;
}