Some time comparison and conversion problems

For some time comparison and conversion problems, you need to enter two time options: HH: MM, namely, hour and minute. & nbsp; I use & lt; inputtype = & quot; text & quot; name = & quot; starttime & quot;/& gt; & lt; inputtype = & quot; t time comparison and conversion problems
You need to enter two time periods: HH: MM, namely, hour and minute.
I use Input
For example, if you enter, how do you convert the two to the time format for comparison? Baidu has a bunch of comparisons between days.
Below is the js I have imitated. there must be a problem with the conversion time. how can I rewrite it?

JScript code

  Function comparetime () {var starttime = document. getElementById ("starttime "). value; var stoptime = document. getElementById ("stoptime "). value; var time1 = (starttime ). toTimeString (); // The method to be processed here is problematic var time2 = (stoptime ). toTimeString (); if (starttime> stoptime) {alert ("incorrect input time") ;}else {alert ("correct ");}}

Another problem is that the searchtime field in my database is of the datetime type,
I update this table on the PHP page. I wonder who will be unable to use PHP after this searchtime + 12 hours.
After the page is updated, I can add a judgment. it is okay to get the time through $ searchtime = $ row ['$ searchtime'], that is, I don't know.
$ How to add these 12 hours to searchtime is also a problem of time format conversion.

------ Solution --------------------
It can be written in this way.

JScript code

Function comparetime () {var starttime = document. getElementById ("starttime "). value; var stoptime = document. getElementById ("stoptime "). value; var t1 = starttime. split (':'); var t2 = stoptime. split (':'); var time1 = new Date (75, 1, 16, t1 [0], t1 [1], 0); var time2 = new Date (75, 1, 16, t2 [0], t2 [1], 0); if (starttime> stoptime) {alert ("incorrect input time ");} else {alert ("correct ");}}
------ Solution --------------------
1,
  

   
JScript code
   
S1 = '11: 30'; s2 = '12: 30'; d = new Date (); t = s1.split (/:/); d. setHours (t [0], t [1]); t1 = d. getTime (); t = s2.split (/:/); d. setHours (t [0], t [1]); t2 = d. getTime (); if (t1> t2) alert ('OK'); else alert ('error ');
------ Solution --------------------
The duibi method does not need alert. simply return false or true.

If (starttimes> = stoptimes ){
Alert ("incorrect input time ");
Return false;
}
Else {
Return true;
}
Function setSubmit (){
.......... Here verify the two input boxes in ACE_HIDDEN_TABLE .................
Var inputs = document. getElementById ('newtb'). getElementsByTagName ('input ');

For (var I = 0; I
    
If (! Duibi (inputs [I]. value, inputs [I + 1]. value )){
Alert ('incorrect input ');
Return false;
}
}
Return true;
}

Then in your form