带有 NSDateFormatter 的 GMT 和 UTC 格式化程序 [英] GMT and UTC formatter with NSDateFormatter
问题描述
我编写了转换当前时间 utc-gmt 或 gmt -utc 的函数.如果 msgArrivedDate 为空，这些函数就可以正常工作.如果不是(这意味着，msgArrivedDate 来自不转换的休息服务.
JSON 解析部分:
NSArray *messageSentTime = [[args valueForKey:@"messageSendDate"] objectAtIndex:0];for(int i=0 ;i< [messageSentTime count]; i++){//[self timeZoneFormatter:@"GMT" :[messageSentTime objectAtIndex:i]];NSLog(@"转换时间 = %@",[self timeZoneFormatter:@"GMT" :[messageSentTime objectAtIndex:i]]);功能部分:
-(id)timeZoneFormatter:(NSString *)formatType : (NSString *)msgArrivedDate{NSDate *日期；NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];if([msgArrivedDate 长度] > 0){date = [dateFormatter dateFromString:msgArrivedDate];} 别的 {日期 = [NSDate 日期];}if([formatType isEqualToString:@"UTC"]){[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];}if([formatType isEqualToString:@"GMT"]){[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];}NSString *dateString = [dateFormatter stringFromDate:date];返回日期字符串；}ReST 以 UTC 格式返回这些值:
<块引用>"2013-09-24 15:03:17","2013-09-25 12:09:22","2013-09-25 13:07:45","2013-09-25 13:08:19",2013-09-25 14:22:38"当我调用该函数时，(NSLog(@"Converted time = %@",[self timeZoneFormatter:@"GMT" :[messageSentTime objectAtIndex:i]])) 返回:
messageSentTime = ("2013-09-24 15:03:17","2013-09-25 12:09:22","2013-09-25 13:07:45","2013-09-25 13:08:19","2013-09-25 14:22:38")我想我只是在这里遗漏了一个小问题:(还没有找到......
改变这个:
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];为此:
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];此方法将处理将日期字符串从 UTC 转换为 GMT 以及从 GMT 转换为 UTC:
- (id)translateDate:(NSString *)msgArrivedDate来自:(NSString *)fromTimeZoneto:(NSString *)toTimeZone {NSDate *date = nil;NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];if([fromTimeZone isEqualToString:@"UTC"]) {[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];}if([fromTimeZone isEqualToString:@"GMT"]) {[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];}if([msgArrivedDate 长度] > 0) {date = [dateFormatter dateFromString:msgArrivedDate];} 别的 {日期 = [NSDate 日期];}if([toTimeZone isEqualToString:@"UTC"]) {[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];}if([toTimeZone isEqualToString:@"GMT"]) {[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];}NSString *dateString = [dateFormatter stringFromDate:date];返回日期字符串；}将2013-09-25 14:22:38"从UTC转换为GMT(即本地时间，在您使用GMT时)将导致2013-09-25 15:22:38，类似地，将2013-09-25 14:22:38"从 GMT 转换为 UTC 将导致 2013-09-25 13:22:38.
i wrote function that converting current time utc-gmt or gmt -utc. The functions just works fine if msgArrivedDate is null. If it's not ( that means , msgArrivedDate comes from rest service that doses not convert .
jSON parse part :
NSArray *messageSentTime = [[args valueForKey:@"messageSendDate"] objectAtIndex:0];
for(int i=0 ;i< [messageSentTime count]; i++)
{
//[self timeZoneFormatter:@"GMT" :[messageSentTime objectAtIndex:i]];
NSLog(@"Converted time = %@",[self timeZoneFormatter:@"GMT" :[messageSentTime objectAtIndex:i]]);
Function part :
-(id)timeZoneFormatter:(NSString *)formatType : (NSString *)msgArrivedDate
{
NSDate *date;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
if([msgArrivedDate length] > 0)
{
date = [dateFormatter dateFromString:msgArrivedDate];
} else {
date = [NSDate date];
}
if([formatType isEqualToString:@"UTC"])
{
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
}
if([formatType isEqualToString:@"GMT"])
{
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
}
NSString *dateString = [dateFormatter stringFromDate:date];
return dateString;
}
ReST returned me to these values in UTC format :
"2013-09-24 15:03:17", "2013-09-25 12:09:22", "2013-09-25 13:07:45", "2013-09-25 13:08:19", "2013-09-25 14:22:38"
When i call the function, (NSLog(@"Converted time = %@",[self timeZoneFormatter:@"GMT" :[messageSentTime objectAtIndex:i]])) returns :
messageSentTime = (
"2013-09-24 15:03:17",
"2013-09-25 12:09:22",
"2013-09-25 13:07:45",
"2013-09-25 13:08:19",
"2013-09-25 14:22:38" )
I think i am just missing little issue over here :( couldn't find yet ...
Change this:
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
to this:
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
Edit: This method will handle translating the date string from UTC to GMT and from GMT to UTC:
- (id)translateDate:(NSString *)msgArrivedDate
from:(NSString *)fromTimeZone
to:(NSString *)toTimeZone {
NSDate *date = nil;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
if([fromTimeZone isEqualToString:@"UTC"]) {
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
}
if([fromTimeZone isEqualToString:@"GMT"]) {
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
}
if([msgArrivedDate length] > 0) {
date = [dateFormatter dateFromString:msgArrivedDate];
} else {
date = [NSDate date];
}
if([toTimeZone isEqualToString:@"UTC"]) {
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
}
if([toTimeZone isEqualToString:@"GMT"]) {
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
}
NSString *dateString = [dateFormatter stringFromDate:date];
return dateString;
}
Converting "2013-09-25 14:22:38" from UTC to GMT (i.e. local time, in your usage of GMT) will result in 2013-09-25 15:22:38, and similarly, converting "2013-09-25 14:22:38" from GMT to UTC will result in 2013-09-25 13:22:38.
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