iOS时间戳字符串NSdate转换demo

1 在项目中我们经常要做时间格式的转换，以下是我封装的NSDate+TimeCategory，希望帮助到大家。

#import <Foundation/Foundation.h>

@interface NSDate (TimeCategory)

/**
 *  字符串转NSDate
 *
 *  @param theTime 字符串时间
 *  @param format  转化格式 如yyyy-MM-dd HH:mm:ss,即2015-07-15 15:00:00
 *
 *  @return <#return value description#>
 */
+ (NSDate *)dateFromString:(NSString *)timeStr
                    format:(NSString *)format;

/**
 *  NSDate转时间戳
 *
 *  @param date 字符串时间
 *
 *  @return 返回时间戳
 */
+ (NSInteger)cTimestampFromDate:(NSDate *)date;

/**
 *  字符串转时间戳
 *
 *  @param theTime 字符串时间
 *  @param format  转化格式 如yyyy-MM-dd HH:mm:ss,即2015-07-15 15:00:00
 *
 *  @return 返回时间戳的字符串
 */
+(NSInteger)cTimestampFromString:(NSString *)timeStr
                          format:(NSString *)format;

/**
 *  时间戳转字符串
 *
 *  @param timeStamp 时间戳
 *  @param format    转化格式 如yyyy-MM-dd HH:mm:ss,即2015-07-15 15:00:00
 *
 *  @return 返回字符串格式时间
 */
+ (NSString *)dateStrFromCstampTime:(NSInteger)timeStamp
                     withDateFormat:(NSString *)format;

/**
 *  NSDate转字符串
 *
 *  @param date   NSDate时间
 *  @param format 转化格式 如yyyy-MM-dd HH:mm:ss,即2015-07-15 15:00:00
 *
 *  @return 返回字符串格式时间
 */
+ (NSString *)datestrFromDate:(NSDate *)date
               withDateFormat:(NSString *)format;
@end

#import "NSDate+TimeCategory.h"

static NSDateFormatter *dateFormatter;

@implementation NSDate (TimeCategory)

+(NSDateFormatter *)defaultFormatter
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        dateFormatter = [[NSDateFormatter alloc]init];
    });
    return dateFormatter;
}

+ (NSDate *)dateFromString:(NSString *)timeStr
                    format:(NSString *)format
{
    NSDateFormatter *dateFormatter = [NSDate defaultFormatter];
    [dateFormatter setDateFormat:format];
    NSDate *date = [dateFormatter dateFromString:timeStr];
    return date;
}

+ (NSInteger)cTimestampFromDate:(NSDate *)date
{
   return (long)[date timeIntervalSince1970];
}

+(NSInteger)cTimestampFromString:(NSString *)timeStr
                          format:(NSString *)format
{
    NSDate *date = [NSDate dateFromString:timeStr format:format];
    return [NSDate cTimestampFromDate:date];
}

+ (NSString *)dateStrFromCstampTime:(NSInteger)timeStamp
                  withDateFormat:(NSString *)format
{
    NSDate *date = [NSDate dateWithTimeIntervalSince1970:timeStamp];
    return [NSDate datestrFromDate:date withDateFormat:format];
}

+ (NSString *)datestrFromDate:(NSDate *)date
               withDateFormat:(NSString *)format
{
    NSDateFormatter* dateFormat = [NSDate defaultFormatter];
    [dateFormat setDateFormat:format];
    return [dateFormat stringFromDate:date];
}

2调用

#import "NSDate+TimeCategory.h"

- (IBAction)strToDate:(id)sender {
    NSString *timeStr = @"2015-07-15 15:00:00";
    NSDate *date = [NSDate dateFromString:timeStr format:@"yyyy-MM-dd HH:mm:ss"];
    NSLog(@"字符串转NSDate：%@ -> %@",timeStr,date);
}

- (IBAction)dateToStamp:(id)sender {

    NSDate *date = [NSDate date];
    NSInteger stamp = [NSDate cTimestampFromDate:date];
    NSLog(@"NSDate转时间戳：%@ ->%ld",date,stamp);
}

- (IBAction)strToStamp:(id)sender {
    NSString *timeStr = @"2015-07-15 15:00:00";
    NSInteger stamp = [NSDate cTimestampFromString:timeStr format:@"yyyy-MM-dd HH:mm:ss"];
     NSLog(@"字符串转时间戳：%@ -> %ld",timeStr,stamp);
}

- (IBAction)stampToStr:(id)sender {
    NSInteger stamp = 1436943600;
    NSString *timeStr = [NSDate dateStrFromCstampTime:stamp withDateFormat:@"yyyy-MM-dd HH:mm:ss"];
     NSLog(@"时间戳转字符串：%ld ->%@",stamp,timeStr);
}

- (IBAction)dateToStr:(id)sender {
    NSDate *date = [NSDate date];
    NSString *timeStr = [NSDate datestrFromDate:date withDateFormat:@"yyyy-MM-dd HH:mm:ss"];
   NSLog(@"NSDate转字符串：%@ ->%@",date,timeStr);
}

分别得到以下结果

2015-07-13 15:02:07.662 TimeDemo[2780:89582]
字符串转NSDate：2015-07-15 15:00:00 -> 2015-07-15 07:00:00 +0000

2015-07-13 15:02:14.653 TimeDemo[2780:89582] NSDate转时间戳：2015-07-13
07:02:14 +0000 ->1436770934

2015-07-13 15:02:20.077 TimeDemo[2780:89582]
字符串转时间戳：2015-07-15 15:00:00 -> 1436943600

2015-07-13 15:02:22.957 TimeDemo[2780:89582]
时间戳转字符串：1436943600 ->2015-07-15 15:00:00

2015-07-13 15:02:25.901 TimeDemo[2780:89582] NSDate转字符串：2015-07-13
07:02:25 +0000 ->2015-07-13 15:02:25

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