Forum Discussion

MarkJFine's avatar
MarkJFine
Professor
8 years ago

Spot the rookie error

Europe changed time at 2am this weekend (we do the same next weekend). But a PHP script routine that I run on a US server to detect time changes in London was broke. I've already fixed it, but who el...
donsjgm's avatar
donsjgm
Junior
8 years ago

Hi Mark,

 

I don't do PHP so I'm just shooting in the dark but to have some fun with it my guess is it should be 

 

=>

Don  :)

  • MarkJFine's avatar
    MarkJFine
    Professor
    8 years ago

    Close...

     

    In the line: if ($time_adj = 3600) {

    =     (single '=') just assigns 3600 to $time_adj and the 'if' always evaluates true because 3600 is greater than 0, so it's always BST (D'oh). It should have been:

    ==   (double '=') which actually tests whether $time_adj is equal to 3600 (3600 sec = 1 hr), meaning the difference between current London time and UTC is 1 hr, or BST. Otherwise the difference would be zero, or UTC/GMT.

     

    Stupid thing gets me every time, just like remembering to end a line with a semi-colon.

    • donsjgm's avatar
      donsjgm
      Junior
      8 years ago

      Well I had the right line.

      I knew that the single '=' was the problem but wasn't sure how to implement the test.

      Like I said, "it was just for fun" and I came close.

      I've been fighting with a property list (plist) to make a Mac update during bonus hours.

      There's been several ppl who have asked how.

      I can't seem to find the 'bug' and it may be OS version specific. So far idk.

       

      It's something like this:

       

      <?xml version="1.0" encoding="UTF-8"?>
      <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
      <plist version="1.0">
      <dict>
          <key>Label</key>
          <string>YourMac.name.here.SftwrUpdt</string>
          <key>ProgramArguments</key>
          <array>
              <string>softwareupdate</string>
      <string>--Download</string>
      <string>--All</string>        
          </array>
          <key>StartCalendarInterval</key>
          <dict>
              <key>Hour</key>
              <integer>02</integer>
      <key>Minute</key>
              <integer>00</integer>

          </dict>
          <key>StandardErrorPath</key>
          <string>/Users/donsjgm/Library/Application\ Support</string>
          <key>ProductPaths</key>
          <string>/Users/donsjgm/Library/Application\ Support</string>
      </dict>
      </plist>

      • MarkJFine's avatar
        MarkJFine
        Professor
        8 years ago

        Interesting. Is it kicking off and giving an error, or just not kicking off?

        If it's kicking off, it might need to be sudo'd.

        Also, not sure what the '--schedule' switch really does, but it might have something to do with it.

         

        Looking at Creating Launch Daemons and Agents:

        I'm guessing you've seen the example for StartCalendarInterval. I'm also assuming the file is in the right folder (one of ~/Library/, /Library/, or /System/Library/; in either the LaunchDaemons or LaunchAgents folders) with the right permissions.