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MySql Start time + duration = endtime

Posted on 2012-08-20
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Last Modified: 2012-08-20
Hi there
I have the following problem. A database that has three columns, and the values ¿¿are saved in the format
cal_date -> 20121114
cal_time -> 123000 (gsm, need to add one hour)
cal_duration -> 90

SELECT date (cal_date) AS date, -> 2012-11-14 - ok
time_format (cal_time + 10000, '% H:% i') AS start_time -> 13:30 added one hour ok

The question is how I add cal_duration 90 minutes to cal_time so I get end_time 15:00

thanks in advance
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Question by:HelgeLind
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Accepted Solution

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lwadwell earned 2000 total points
ID: 38311190
have a look at:
SELECT date (cal_date) AS date,
       time_format(cal_time + 10000, '%H:%i') AS start_time,
       DATE_ADD(STR_TO_DATE(concat(cal_date,cal_time),'%Y%m%d%H%i%s'), interval 60 minute),
       DATE_ADD(STR_TO_DATE(concat(cal_date,cal_time),'%Y%m%d%H%i%s'), interval 60+duration minute)
from (select 20121114 as cal_date, 123000 as cal_time, 90 as duration union all
      select 20121114 as cal_date, 233000 as cal_time, 187 as duration)v

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Author Closing Comment

by:HelgeLind
ID: 38311386
Thanks, lot of timesavning for me :)
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LVL 25

Expert Comment

by:lwadwell
ID: 38311417
are your cal_time values numeric or string?  If they do not have leading 0 for times before midday - you may want to do:
STR_TO_DATE(concat(cal_date,right(concat('00',cal_time),6)),'%Y%m%d%H%i%s')
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Author Comment

by:HelgeLind
ID: 38311735
Quite true, I saw it
80000 - 8 am is not working
110000 - 11 am is working
different lengths of strings

final:
TIME_FORMAT(DATE_ADD(STR_TO_DATE(concat(cal_date,right(concat('00',cal_time),6)),'%Y%m%d%H%i%s'), interval 60 minute ), '%H:%i') as start_time,
TIME_FORMAT(DATE_ADD(STR_TO_DATE(concat(cal_date,right(concat('00',cal_time),6)),'%Y%m%d%H%i%s'), interval 60+cal_duration minute ), '%H:%i') as end_time

now i works :)
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