Objective c 更改时间格式目标c

我正在以这种格式“dd-MM-yyyy-HH:MM:ss-a”从服务器获取时间，并将其转换为这种格式“dd-MM-yyyy-HH:MM-a”。转换时，时间比原始时间提前一小时

这是我从服务器获取的时间 创建日期2017年6月29日01:44:43下午 转换时间 修改日期2017年6月29日下午12:44

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是否有人可以帮助我从服务器获取的时间中删除秒数

您可以如下设置日期格式化程序的时区：

[gmtDf setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];

样本：

NSString *str = @"29-Jun-2017 01:44:43 PM";
NSDateFormatter* gmtDf = [[NSDateFormatter alloc] init];
[gmtDf setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
[gmtDf setDateFormat:@"dd-MM-yyyy HH:mm:ss a"];
NSDate* gmtDate = [gmtDf dateFromString:str];
NSLog(@"%@",gmtDate);

其他时区名称：

    ADT = "America/Halifax";
    AKDT = "America/Juneau";
    AKST = "America/Juneau";
    ART = "America/Argentina/Buenos_Aires";
    AST = "America/Halifax";
    BDT = "Asia/Dhaka";
    BRST = "America/Sao_Paulo";
    BRT = "America/Sao_Paulo";
    BST = "Europe/London";
    CAT = "Africa/Harare";
    CDT = "America/Chicago";
    CEST = "Europe/Paris";
    CET = "Europe/Paris";
    CLST = "America/Santiago";
    CLT = "America/Santiago";
    COT = "America/Bogota";
    CST = "America/Chicago";
    EAT = "Africa/Addis_Ababa";
    EDT = "America/New_York";
    EEST = "Europe/Istanbul";
    EET = "Europe/Istanbul";
    EST = "America/New_York";
    GMT = GMT;
    GST = "Asia/Dubai";
    HKT = "Asia/Hong_Kong";
    HST = "Pacific/Honolulu";
    ICT = "Asia/Bangkok";
    IRST = "Asia/Tehran";
    IST = "Asia/Calcutta";
    JST = "Asia/Tokyo";
    KST = "Asia/Seoul";
    MDT = "America/Denver";
    MSD = "Europe/Moscow";
    MSK = "Europe/Moscow";
    MST = "America/Denver";
    NZDT = "Pacific/Auckland";
    NZST = "Pacific/Auckland";
    PDT = "America/Los_Angeles";
    PET = "America/Lima";
    PHT = "Asia/Manila";
    PKT = "Asia/Karachi";
    PST = "America/Los_Angeles";
    SGT = "Asia/Singapore";
    UTC = UTC;
    WAT = "Africa/Lagos";
    WEST = "Europe/Lisbon";
    WET = "Europe/Lisbon";
    WIT = "Asia/Jakarta";

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HH:mm a

HH

+

a

？

HH:mm a

而不是否？对于其余部分，我想这是一个时区问题。我的意思是“HH”=>24h格式。“a”：“AM/PM”。但“AM/PM”只有在使用12h格式时才有意义，不是吗？这是为了区分14h=2hPM和2h=2hAM？你可以接受适合你的答案。@SherineSJ