How to convert string to Time(dataType) field in apex

Question

I was trying to convert string to Time datatype in apex, any one help on this would be great.

Salesforce recently come up with new datatypes Time, URL. I was using the Time datatype and am unable to convert string value to Time.

Error:

Illegal assignment from String to Time error

Code:

APS_Treatment__c treat = [SELECT Id, APS_Start_Date__c, APS_Time1__c, 
    APS_Time_1__c FROM APS_Treatment__c WHERE Id = :TreatId]; 

DateTime appTime = treat.APS_Start_Date__c; 
appTime = appTime.addhours(treat.APS_Time_1__c.hour()); 
appTime = appTime.addminutes(treat.APS_Time_1__c.minute()); 
String sd = String.valueOf(appTime.format('hh:mm:ss\'z\'')); 
treat.APS_Time_1__c = sd; 
update treat;

Answer 1

You can use Time.newInstance method to construct the Time from Date time:

Example:

DateTime dt = System.today();
Time myTime = Time.newInstance(dt.hour(), dt.minute(), dt.second(), dt.millisecond());

Your code needs to be modified as:

APS_Treatment__c treat = [SELECT Id, APS_Start_Date__c, APS_Time1__c, 
    APS_Time_1__c FROM APS_Treatment__c WHERE Id = :TreatId]; 

DateTime appTime = treat.APS_Start_Date__c; 
treat.APS_Time_1__c = 
    Time.newInstance(
        appTime.hour(), 
        appTime.minute(), 
        appTime.second(), 
        appTime.millisecond()); 
update treat;