将NSDate转换为毫秒的纪元时间 [英] Convert a NSDate to milliseconds epoch time
本文介绍了将NSDate转换为毫秒的纪元时间的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要能够将日期转换为时间戳,一个以毫秒为单位的纪元。
我在网上看到的只是将毫秒转换为NSDate而不是相反。那里有任何帮助吗?
I need to be able to convert a date to a time stamp, an epoch in milliseconds. All I see online are for converting milliseconds to NSDate and not the other way round. Any help out there?
推荐答案
NSTimeInterval是一个双精度数,它已包含小数点后的亚秒数据。根据您的需要,转换可能很简单,乘以1000。
NSTimeInterval is a double that already contains sub-second data after the decimal point. Depending what you need, your conversion could be a simple as multiplying by 1000.
- (void)testDateFormat
{
NSDate *date = [NSDate date];
NSLog(@"Time: %f", floor([date timeIntervalSince1970] * 1000));
NSLog(@"Time: %f", floor([date timeIntervalSince1970]));
NSLog(@"Time: %lli", [@(floor([date timeIntervalSince1970] * 1000)) longLongValue]);
NSLog(@"Time: %lli", [@(floor([date timeIntervalSince1970])) longLongValue]);
}
// Result
// 2013-04-15 13:28:11.284 TestApp[10469:907] Time: 1366057691284.000000
// 2013-04-15 13:28:11.286 TestApp[10469:907] Time: 1366057691.000000
// 2013-04-15 13:28:11.287 TestApp[10469:907] Time: 1366057691284
// 2013-04-15 13:28:11.288 TestApp[10469:907] Time: 1366057691
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