iOS获取当天开始时间00:00和结束时间23:59时间戳

一个项目请求参数后台要求一天开始时间和结束时间，如下所示：

{
    "storeId": "020120",   //门店编码
    "gmtStart": 1582128000000,  //开始时间,可以是 一天零点
    "gmtEnd": 1582214399999   //开始时间,可以是 一天23:59:59
}

代码封装如下：

- (NSString *)getTime: (NSInteger)hour andMinute:(NSInteger)minute {
    NSCalendar *greCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];
    [greCalendar setTimeZone: timeZone];

    NSDateComponents *dateComponents = [greCalendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay  fromDate:[NSDate date]];
    //  定义一个NSDateComponents对象，设置一个时间点
    NSDateComponents *dateComponentsForDate = [[NSDateComponents alloc] init];
    [dateComponentsForDate setDay:dateComponents.day];
    [dateComponentsForDate setMonth:dateComponents.month];
    [dateComponentsForDate setYear:dateComponents.year];
    [dateComponentsForDate setHour:hour];
    [dateComponentsForDate setMinute:minute];

    NSDate *dateFromDateComponentsForDate = [greCalendar dateFromComponents:dateComponentsForDate];
    NSString *timeSp = [NSString stringWithFormat:@"%ld", (long)[dateFromDateComponentsForDate timeIntervalSince1970]*1000];
    return timeSp;
}

调用如下：

NSString *startTime = [self getTime:0 andMinute:0];
    NSString *endTime = [self getTime:23 andMinute:59];

得到的值到以下工具转换验证即可。
https://tool.lu/timestamp/