Logical reason for strtotime('east') and strtotime('west')returning valid results?
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From: Kevin Kinsey on 5 Apr 2010 14:15 Colin Guthrie wrote: > > For example, I discovered that some words (or strings beginning with > those words) will return false positives: > > e.g.: > > [colin(a)jimmy Search (working)]$ php -r 'var_dump(strtotime("east"));' > int(1270514111) > [colin(a)jimmy Search (working)]$ php -r 'var_dump(strtotime("west"));' > int(1270488914) > [colin(a)jimmy Search (working)]$ php -r 'var_dump(strtotime("now"));' > int(1270488928) > > > The last one is valid! But the other two appear to do much the same thing... > > Can anyone think of why this would be valid results before I report this > to the relevant authorities? Time Zones? [11] Mon 05.Apr.2010 13:05:41 [admin(a)archangel][~] php -r "echo date('r',strtotime('now'));" Mon, 05 Apr 2010 13:05:47 -0500 This is correct for my timezone (US Central Daylight Time). [12] Mon 05.Apr.2010 13:05:47 [admin(a)archangel][~] php -r "echo date('r',strtotime('east'));" Mon, 05 Apr 2010 14:05:51 -0500 This is correct for the time zone east of me, US Eastern Daylight Time. However, the TZ offset is wrong for that TZ, it's still mine. [13] Mon 05.Apr.2010 13:05:51 [kadmin(a)archangel][~] php -r "echo date('r',strtotime('west'));" Mon, 05 Apr 2010 07:05:59 -0500 This is correct for American Samoa, but I've no idea why :-D Nonetheless, I'm suspecting the programmers had something like this in mind. Isn't strtotime() based on some GNU utility? Kevin Kinsey
From: Kevin Kinsey on 7 Apr 2010 00:21
Colin Guthrie wrote: > 'Twas brillig, and Kevin Kinsey at 05/04/10 19:15 did gyre and gimble: >> Nonetheless, I'm suspecting the programmers had something >> like this in mind. > > Yeah I guess that's why it interprets these terms. Good thinking :) > >> Isn't strtotime() based on some GNU utility? > > Yeah, that's why I said "the relevant authorities". I couldn't remember > off-hand where it came from so figured I'd not blame "PHP" just yet :p Apparently these strings are being recognized as TZ stamps, but the underlying logic is "not fully implemented": see http://www.gnu.org/s/libc/manual/html_node/Low_002dLevel-Time-String-Parsing.html Try it with some TZ stamps ... I'm pretty sure that in the previous example it was taking "East" to be "EST", as I observed (rather by accident) earlier. Kevin Kinsey |