Adding 30 minutes to time formatted as H i in PHP

Question

Having a nightmare at the moment and just can t see why it isn t working  I have a value in the form H i  ie 10 00  13 30  etc called  time  What I want to do is create two new values   startTime which is 30 mins before  time and  endTime which is 30 mins after  time  I have tried the following but just doesn t seem to want to work   startTime   date  H i  strtotime  -30 minutes   time     endTime   date  H i  strtotime   30 minutes   time      If I pass through 10 00 as  time and echo out both  startTime and  endTime I get    startTime   00 30  startTime   01 30

User · Answer

time   30   60    30 minutes  start time   date  Y-m-d h i s   time   -  time    end time   date  Y-m-d h i s   time      time

User · Answer

time   strtotime  10 00     startTime   date  H i   strtotime  -30 minutes    time     endTime   date  H i   strtotime   30 minutes    time

User · Answer

I usually take a slightly different track to achieve this   startTime   date  quot H i quot  time   - 1800    endTime   date  quot H i quot  time     1800    Where 1800 seconds   30 minutes

User · Answer

What you need is a datetime which is 30 minutes later than your given datetime  and a datetime which is 30 minutes before a given datetime  In other words  you need a future datetime and a past datetime  Hence  classes that achieve that are called Future and Past  What data do they need to calculate what you need  Apparently  they must have a datetime relative to which to count those 30 minutes  and an interval itself -- 30 minutes in your case  Thus  the desired datetime looks like the following  use Meringue ISO8601DateTime FromCustomFormat as DateTimeCreatedFromCustomFormat    new Future      new DateTimeCreatedFromCustomFormat  H i    10 00        new NMinutes 30         - gt value     If you want to format it somehow  you can do  use Meringue ISO8601DateTime FromCustomFormat as DateTimeCreatedFromCustomFormat    new ISO8601Formatted      new Future          new DateTimeCreatedFromCustomFormat  H i    10 00            new NMinutes 30              H i         - gt value     It s more verbose  but I guess it s way less cryptic than built-in php functions  If you liked this approach  you can learn some more about the meringue library used in this example  and the overall approach

User · Answer

Just to expand on previous answers  a function to do this could work like this  changing the time and interval formats however you like them according to this for function date  and this for DateInterval       Return adjusted start and end times as an array   function expandTimeByMinutes   time   beforeMinutes   afterMinutes           time   DateTime  createFromFormat   H i    time         time- gt sub  new DateInterval   PT       integer   beforeMinutes      M            startTime    time- gt format   H i          time- gt add  new DateInterval   PT       integer   beforeMinutes    integer   afterMinutes      M            endTime    time- gt format   H i          return            startTime    gt   startTime           endTime      gt   endTime             adjustedStartEndTime   expandTimeByMinutes   10 00   30  30     echo   lt h1 gt Adjusted Start Time       adjustedStartEndTime  startTime       lt  h1 gt     PHP EOL   PHP EOL  echo   lt h1 gt Adjusted End Time         adjustedStartEndTime  endTime         lt  h1 gt     PHP EOL   PHP EOL

User · Answer

In order for that to work  time has to be a timestamp  You cannot pass in  10 00  or something like  time   date  H i    10 00    which is what you seem to do  because then I get 0 30 and 1 30 as results too    Try   time   strtotime  10 00      As an alternative  consider using DateTime  the below requires PHP 5 3 though     dt   DateTime  createFromFormat  H i    10 00       create today 10 o clock  dt- gt sub new DateInterval  PT30M                     substract 30 minutes echo  dt- gt format  H i                                echo modified time  dt- gt add new DateInterval  PT1H                      add 1 hour echo  dt- gt format  H i                                echo modified time   or procedural if you don t like OOP   dateTime   date create from format  H i    10 00    date sub  dateTime  date interval create from date string  30 minutes     echo date format  dateTime   H i    date add  dateTime  date interval create from date string  1 hour     echo date format  dateTime   H i

User · Answer

Your current solution does not work because  time is a string - it needs to be a Unix timestamp  You can do this instead    unix time   strtotime  January 1 2010    time      create a unix timestamp  startTime date   H i   strtotime  -30 minutes    unix time      endTime date   H i   strtotime   30 minutes    unix time

User · Answer

echo date   Y-m-d H i s   strtotime  2016-10-10 15 00 00    60 30      2016-10-10 15 30 00   or  echo date   H i s   strtotime  15 00 00    60 30        15 30 00   or  echo date   H i s   strtotime date  H i s     60 30        15 30 00

[php] Adding 30 minutes to time formatted as H:i in PHP

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