[英]How to round off timestamp in milliseconds to nearest seconds?
How to round off the current timestamp in milliseconds to seconds? 如何将当前时间戳以毫秒为单位舍入到秒?
If this is the current timestamp in milliseconds I have - 如果这是我以毫秒为单位的当前时间戳 -
1384393612958
The if I am rounding off to nearest second then will it be like this? 如果我四舍五入到最接近的秒,那么它会是这样吗?
Time in MS rounded off to nearest Second = 1384393612000
I might need to do this both in Java and C++. 我可能需要在Java和C ++中都这样做。
If you are using Python: 如果您使用的是Python:
old_number = 1384393612958
new_number = 1000 * (old_number / 1000)
print new_number
Basically you want to use an integer number, divide by one thousand (to shave off the milli-seconds), and then multiple by thousand to get the ms value rounded to seconds. 基本上你想要使用一个整数,除以一千(以减去毫秒),然后乘以千来得到ms值四舍五入到秒。
In Java you can use Calendar to something like this: 在Java中,您可以将Calendar用于以下内容:
Calendar cal = Calendar.getInstance().setTimeInMillis(millisec);
int seconds = cal.get(Calendar.SECONDS);
Alternatively (and can work for C++ too) you can do: 或者(也可以用于C ++)你可以这样做:
int sec = ((millisec + 500) / 1000);
adding 500 ms allows you to round the number properly. 添加500毫秒可以正确舍入数字。
Instant.ofEpochMilli( 1_384_393_612_958L )
.truncatedTo( ChronoUnit.SECONDS )
.toEpochMilli()
The modern approach in Java uses the java.time classes. Java中的现代方法使用java.time类。
The Instant
class represents a point on the timeline in UTC with a resolution of nanoseconds. Instant
类表示UTC时间轴上的一个点,分辨率为纳秒。
Instant instant = Instant.ofEpochMilli( 1_384_393_612_958L ) ;
Instant instantTrunc = instant.truncatedTo( ChronoUnit.SECONDS ) ;
long millis = instantTrunc.toEpochMilli() ;
This is needed to convert java date object to mysql datetime formatted string in sql queries.
Conversion: 转换:
Calendar cal = Calendar.getInstance();
cal.setTime(this.id.getCreatedOn());
if (cal.get(Calendar.MILLISECOND) >= 500 ) {
System.out.println("Round off milliseconds to seconds");
cal.set(Calendar.SECOND, cal.get(Calendar.SECOND) + 1);
}
Date roundedCreatedOn = cal.getTime();
Actual query string contains: 实际查询字符串包含:
createdOn = '" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(roundedCreatedOn)+ "'" createdOn ='“+ new SimpleDateFormat(”yyyy-MM-dd HH:mm:ss“)。format(roundedCreatedOn)+”'“
在javascript中,使用moment.js库:
moment(timestamp).startOf('second')
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