Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
535 views
in Technique[技术] by (71.8m points)

c# - How to round a DateTime in MySQL?

I want to discretize the DateTime with the resolution of 5 minutes. I did it in C#, but how to convert the following code to MySQL?

DateTime Floor(DateTime dateTime, TimeSpan resolution)
{
    return new DateTime
        (
             timeSpan.Ticks * 
             (long) Math.Floor
             (
                  ((double)dateTime.Ticks) / 
                  ((double)resolution.Ticks)
             )
        );
}
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

It's a little nasty when you do it with datetime data types; a nice candidate for a stored function.

DATE_SUB(DATE_SUB(time, INTERVAL MOD(MINUTE(time),5) MINUTE ), 
         INTERVAL SECOND(time) SECOND)

It's easier when you use UNIXTIME timestamps but that's limited to a 1970 - 2038 date range.

FROM_UNIXTIME(UNIX_TIMESTAMP(time) - MOD(UNIX_TIMESTAMP(time),300))

Good luck.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...