NSDate是项目开发中常用的类，用于时间的转换，下面将一些NSDate常用的方法集成在一个类DateConversion中，以供调用。
DateConversion.h文件如下：
#import <Foundation/Foundation.h>
@interface DateConversion : NSObject
/// 获取默认的date formatter
+ (NSDateFormatter *)getDateFormatter;
/// 将utc时间转换为默认日期格式字符串
+ (NSString *)utcToDateString:(long)utc;
/// 将utc时间转换为字符串, @"yyyy MM dd HH:mm:ss Z", 英文模式 MMM
+ (NSString *)utcToDateString:(long)utc dateFormat:(NSString *)format;
/// 将字符串转换为utc时间
+ (long)dateFormatToUTC:(NSString *)dateString dateFormat:(NSString *)format;
/// 将北京时区字符串转换为utc时间
+ (long)beijingDateStringToUTC:(NSString *)dateString dateFormat:(NSString *)format;
/// 将时间转换为新的格式
+ (NSString *)dateStringToFormatString:(NSString *)dateStr format:(NSString *)format toFormat:(NSString *)toFormat;
/// 获取每周第一天的utc
+ (long)getFirstUTCInWeekForUTC:(long)utc;
/// 获取每周最后一天的utc
+ (long)getLastUTCInWeekForUTC:(long)utc;
/// 获取当前utc是在以周日开始的一周的第几天
+ (int)getWeekDayForUTC:(long)utc;
/// 获取每月第一天的utc
+ (long)getFistDayUTCInMonthForUTC:(long)utc;
/// 获取每年第一天的utc
+ (long)getFistDayUTCInYearForUTC:(long)utc;
/// 获取本月天数
+ (int)getDaysInThisMonthWithUTC:(long)utc;
/// 获取本年天数
+ (int)getDaysInThisYearWithUTC:(long)utc;
/// 计算 utc 时间为周几
+ (NSString *)getWeekStringForUTC:(long)utc;
/// 获取月份文本
+ (NSString *)getMonthString:(NSInteger)index;
/// 获取随机整数值
+ (int)getRandomInt:(int)from to:(int)to;
/// 获取随机浮点数值
+ (float)getRandomFloat:(float)from to:(float)to;
/// 获取时间文本 xHxxMin
+ (NSString *)getTimeString:(int)time;
//// 获取时间文本 HH:MM
+ (NSString *)getHourMinuTimeString:(int)time;
/// 获取日期文本，是否显示年
+ (NSString *)dateStringWithUTC:(long)utc year:(BOOL)year;
@end
DateConversion.m文件如下：
#import "DateConversion.h"
@implementation DateConversion
/// 获取默认的date formatter
+ (NSDateFormatter *)getDateFormatter {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]]; // 获得正确的返回日期，避免日本日历、佛教日历取date异常
[dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
return dateFormatter;
}
/// 将utc时间转换为默认日期格式字符串
+ (NSString *)utcToDateString:(long)utc {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateStyle = NSDateFormatterMediumStyle;
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]]; // 获得正确的返回日期，避免日本日历、佛教日历取date异常
[dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
NSString *dateString = [dateFormatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
return dateString;
}
/// 将utc时间转换为字符串, @"yyyy MM dd HH:mm:ss Z", 英文模式 MMM
+ (NSString *)utcToDateString:(long)utc dateFormat:(NSString *)format {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = format;
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]]; // 获得正确的返回日期，避免日本日历、佛教日历取date异常
[dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
NSString *dateString = [dateFormatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
return dateString;
}
/// 将字符串转换为utc时间
+ (long)dateFormatToUTC:(NSString *)dateString dateFormat:(NSString *)format {
long utc = 0;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = format;
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]]; // 获得正确的返回日期，避免日本日历、佛教日历取date异常
[dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
utc = [[dateFormatter dateFromString:dateString] timeIntervalSince1970];
return utc;
}
/// 将北京时区字符串转换为手机当前utc时间
+ (long)beijingDateStringToUTC:(NSString *)dateString dateFormat:(NSString *)format {
long utc = [self dateFormatToUTC:dateString dateFormat:format];
NSInteger offset = [[NSTimeZone localTimeZone] secondsFromGMTForDate:[NSDate date]]; // 手机当前时区与格林威治时间的时间差
utc = utc + offset - 8*3600;
return utc;
}
/// 将时间转换为新的格式
+ (NSString *)dateStringToFormatString:(NSString *)dateStr format:(NSString *)format toFormat:(NSString *)toFormat {
NSDateFormatter *curFormat = [[NSDateFormatter alloc] init];
curFormat.dateFormat = format;
// 获得正确的返回日期，避免日本日历、佛教日历取date异常的问题
NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]];
[curFormat setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
[curFormat setLocale:locale];
NSDateFormatter *newFormat = [[NSDateFormatter alloc] init];
newFormat.dateFormat = toFormat;
[newFormat setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
[newFormat setLocale:locale];
NSString *formatString = [newFormat stringFromDate:[curFormat dateFromString:dateStr]];
return formatString;
}
/// 获取每周第一天的utc
+ (long)getFirstUTCInWeekForUTC:(long)utc {
NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitWeekday
fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
/// 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)
int week[7] = {1, 2, 3, 4, 5, 6, 7};
int current_wd = week[[comp weekday] - 1]; /// 当前星期
long first_utc = utc - (current_wd - 1) * 24 * 3600;
return first_utc;
}
/// 获取每周最后一天的utc
+ (long)getLastUTCInWeekForUTC:(long)utc {
NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitWeekday
fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
/// 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)
int week[7] = {1, 2, 3, 4, 5, 6, 7};
int current_wd = week[[comp weekday] - 1]; /// 当前星期
long last_utc = utc - (current_wd - 7) * 24 * 3600;
return last_utc;
}
/// 获取当前utc是在以周日开始的一周的第几天
+ (int)getWeekDayForUTC:(long)utc {
NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitWeekday
fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
return (int)[comp weekday];
}
/// 获取每月第一天的utc
+ (long)getFistDayUTCInMonthForUTC:(long)utc {
NSString *year = [DateConversion utcToDateString:utc dateFormat:@"yyyy MM"];
NSString *firstday = [NSString stringWithFormat:@"%@ 01", year];
return [DateConversion dateFormatToUTC:firstday dateFormat:@"yyyy MM dd"];
}
/// 获取每年第一天的utc
+ (long)getFistDayUTCInYearForUTC:(long)utc {
NSString *year = [DateConversion utcToDateString:utc dateFormat:@"yyyy"];
NSString *firstday = [NSString stringWithFormat:@"%@ 01 01", year];
return [DateConversion dateFormatToUTC:firstday dateFormat:@"yyyy MM dd"];
}
/// 获取本月天数
+ (int)getDaysInThisMonthWithUTC:(long)utc {
NSRange daysInLastMonth = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] rangeOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitMonth
forDate:[NSDate dateWithTimeIntervalSince1970:utc]];
return (int)daysInLastMonth.length;
}
/// 获取本年天数
+ (int)getDaysInThisYearWithUTC:(long)utc {
int year = [[self utcToDateString:utc dateFormat:@"yyyy"] intValue];
int days = 365;
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
days = 366; /// 闰年366天
}
return days;
}
/// 计算 utc 时间为周几
+ (NSString *)getWeekStringForUTC:(long)utc {
int day = [DateConversion getWeekDayForUTC:utc] - 1;
NSArray *weekArr = @[NSLocalizedString(@"calendar_sun", nil),
NSLocalizedString(@"calendar_mon", nil),
NSLocalizedString(@"calendar_tue", nil),
NSLocalizedString(@"calendar_wed", nil),
NSLocalizedString(@"calendar_thu", nil),
NSLocalizedString(@"calendar_fri", nil),
NSLocalizedString(@"calendar_sat", nil),];
return weekArr[day];
}
/// 获取月份文本
+ (NSString *)getMonthString:(NSInteger)index {
NSArray *monthArr = @[NSLocalizedString(@"January", nil),
NSLocalizedString(@"February", nil),
NSLocalizedString(@"March", nil),
NSLocalizedString(@"April", nil),
NSLocalizedString(@"May", nil),
NSLocalizedString(@"June", nil),
NSLocalizedString(@"July", nil),
NSLocalizedString(@"August", nil),
NSLocalizedString(@"September", nil),
NSLocalizedString(@"October", nil),
NSLocalizedString(@"November", nil),
NSLocalizedString(@"December", nil)];
return monthArr[index - 1];
}
/// 获取随机整数值
+ (int)getRandomInt:(int)from to:(int)to {
return (int)(from + (arc4random() % (to - from + 1)));
}
/// 获取随机浮点数值
+ (float)getRandomFloat:(float)from to:(float)to {
float diff = to - from;
return (((float) arc4random() / UINT_MAX) * diff) + from;
}
//// 获取时间文本 xHxxMin
+ (NSString *)getTimeString:(int)time {
int hour = time / 60;
int minu = time - hour*60;
if (hour != 0 && minu < 0) {
minu = abs(minu);
}
NSString *str_1 = hour == 0 ? @"" : [NSString stringWithFormat:@"%d", hour];
NSString *str_2 = hour == 0 ? @"" : [NSString stringWithFormat:@"%@", NSLocalizedString(@"sleep_hour", nil)];
NSString *str_3 = [NSString stringWithFormat:@"%d", minu];
NSString *str_4 = [NSString stringWithFormat:@"%@", NSLocalizedString(@"sleep_min", nil)];
if (minu == 0) {
str_3 = @"";
str_4 = @"";
}
return [NSString stringWithFormat:@"%@%@%@%@", str_1, str_2, str_3, str_4];
}
//// 获取时间文本 HH:MM
+ (NSString *)getHourMinuTimeString:(int)time {
if (time == 0) {
return [NSString stringWithFormat:@"--:--"];
}
int hour = time / 60;
int minu = time - hour*60;
if (hour != 0 && minu < 0) {
minu = abs(minu);
}
return [NSString stringWithFormat:@"%02d:%02d", hour, minu];
}
/// 获取日期文本，是否显示年
+ (NSString *)dateStringWithUTC:(long)utc year:(BOOL)year {
NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitHour|kCFCalendarUnitMinute|kCFCalendarUnitSecond|kCFCalendarUnitWeekday
fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
NSString *dateString = @"";
if ([APPModelManager isChinaCalendar]) {
if (year) {
dateString = [NSString stringWithFormat:@"%@%@%@",
[NSString stringWithFormat:@"%zi%@", comp.year, NSLocalizedString(@"report_year", nil)],
[NSString stringWithFormat:@"%zi%@", comp.month, NSLocalizedString(@"report_month", nil)],
[NSString stringWithFormat:@"%zi%@", comp.day, NSLocalizedString(@"report_day", nil)]];
}
else {
dateString = [NSString stringWithFormat:@"%@%@",
[NSString stringWithFormat:@"%zi%@", comp.month, NSLocalizedString(@"report_month", nil)],
[NSString stringWithFormat:@"%zi%@", comp.day, NSLocalizedString(@"report_day", nil)]];
}
}
else {
if (year) {
NSString *yeaStr = [NSString stringWithFormat:@"%zi", comp.year];
NSString *monStr = [DateConversion getMonthString:comp.month];
NSString *dayStr = [NSString stringWithFormat:@"%zi", comp.day];
dateString = [NSString stringWithFormat:@"%@ %@, %@", monStr, dayStr, yeaStr];
}
else {
NSString *monStr = [DateConversion getMonthString:comp.month];
NSString *dayStr = [NSString stringWithFormat:@"%zi", comp.day];
dateString = [NSString stringWithFormat:@"%@ %@", monStr, dayStr];
}
}
return dateString;
}
@end
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