Testing strtotime() input/output for a variety of strings

gistfile1.txt

******* strtotime() test run on Friday (2014-03-21 22:28:50-UTC) **********

---- testing day of week ----
Wednesday           = 2014-03-26 <-- the next Wednesday (not the last)
Wednesday next week = 2014-04-02 <-- interpretted as "the first Wednesday after one week from today" rather than "the next Wednesday"
Friday              = 2014-03-21 <-- today!
Friday next week    = 2014-03-28 <-- one week

---- testing day of month ----
First day of March     = 1970-01-01 <-- requires specific integer day (i.e. date( 't' ) )
first day March        = 2014-03-22 <-- does not compute
First day of the month = 1970-01-01 <-- requires specific integer day (i.e. date( 't' ) )
first day next month   = 2014-04-22 <-- does not compute
10                     = 1970-01-01 <-- requires month
21                     = 1970-01-01 <-- requires month
10th                   = 1970-01-01 <-- requires month
21st                   = 1970-01-01 <-- requires month
10th day               = 1970-01-01 <-- requires month
21st day               = 1970-01-01 <-- requires month
Last day of March      = 1970-01-01 <-- requires specific integer day (i.e. date( 't' ) )
last day March         = 2014-03-20 <-- yesterday?
Last day of the month  = 1970-01-01 <-- requires specific integer day (i.e. date( 't' ) )
last day next month    = 2014-04-20 <-- interpretted as "one month from yesterday"

---- testing day of year ----
10 February           = 2014-03-10 <-- the 10th of February this year (in the past)
10 February next year = 2015-03-10 <-- the 10th of February next year
10 March              = 2014-03-10 <-- the 10th of March this year (in the past)
10 March next year    = 2015-03-10 <-- the 10th of March next year
21 March              = 2014-03-21 <-- today!
21 March next year    = 2015-03-21 <-- one year
30 March              = 2014-03-30 <-- the next 30th of March
30 March next year    = 2015-03-30 <-- interpretted as "the first 30th March after one year from today" rather than "the next 30th March"

test-strtotime.php

<?php

$from_timestamp = gmdate( "U" );
$current_day    = gmdate( "j" );
$current_month  = gmdate( "F" );

error_log( "******* strtotime() test run on " . gmdate( "l" ) . " (" . gmdate( "Y-m-d H:i:s-e" ) . ") **********" );

error_log( "- 1 months = " . date( "Y-m-d", strtotime( "- 1 months", $from_timestamp ) ) );
error_log( "- 3 months = " . date( "Y-m-d", strtotime( "- 3 months", $from_timestamp ) ) );
error_log( "+ 1 months = " . date( "Y-m-d", strtotime( "+ 1 months", $from_timestamp ) ) );
error_log( "+ 3 months = " . date( "Y-m-d", strtotime( "+ 3 months", $from_timestamp ) ) );

error_log( "---- testing day of week ----" );
error_log( "Wednesday           = " . date( "Y-m-d", strtotime( "Wednesday", $from_timestamp ) ) );
error_log( "Wednesday next week = " . date( "Y-m-d", strtotime( "Wednesday next week", $from_timestamp ) ) );
error_log( "Friday              = " . date( "Y-m-d", strtotime( "Friday", $from_timestamp ) ) );
error_log( "Friday next week    = " . date( "Y-m-d", strtotime( "Friday next week", $from_timestamp ) ) );


error_log( "---- testing day of month ----" );
error_log( "First day of {$current_month}      = " . date( "Y-m-d", strtotime( "First day of {$current_month}", $from_timestamp ) ) );
error_log( "first day {$current_month}         = " . date( "Y-m-d", strtotime( "first day {$current_month}", $from_timestamp ) ) );
error_log( "First day of the month  = " . date( "Y-m-d", strtotime( "First day of the month", $from_timestamp ) ) );
error_log( "first day next month    = " . date( "Y-m-d", strtotime( "first day next month", $from_timestamp ) ) );
error_log( "10                      = " . date( "Y-m-d", strtotime( "10", $from_timestamp ) ) );
error_log( "{$current_day}                      = " . date( "Y-m-d", strtotime( "{$current_day}", $from_timestamp ) ) );
error_log( "10th                    = " . date( "Y-m-d", strtotime( "10th", $from_timestamp ) ) );
error_log( "{$current_day}th                    = " . date( "Y-m-d", strtotime( "{$current_day}th", $from_timestamp ) ) );
error_log( "10th day                = " . date( "Y-m-d", strtotime( "10th day", $from_timestamp ) ) );
error_log( "{$current_day}th day                = " . date( "Y-m-d", strtotime( "{$current_day}st day", $from_timestamp ) ) );
error_log( "Last day of {$current_month}       = " . date( "Y-m-d", strtotime( "Last day of {$current_month}", $from_timestamp ) ) );
error_log( "last day {$current_month}          = " . date( "Y-m-d", strtotime( "last day {$current_month}", $from_timestamp ) ) );
error_log( "Last day of the month   = " . date( "Y-m-d", strtotime( "Last day of the month", $from_timestamp ) ) );
error_log( "last day next month     = " . date( "Y-m-d", strtotime( "last day next month", $from_timestamp ) ) );


error_log( "---- testing day of year ----" );
error_log( "10 February           = " . date( "Y-m-d", strtotime( "10 February", $from_timestamp ) ) );
error_log( "10 February next year = " . date( "Y-m-d", strtotime( "10 February next year", $from_timestamp ) ) );
error_log( "10 {$current_month}              = " . date( "Y-m-d", strtotime( "10 {$current_month}", $from_timestamp ) ) );
error_log( "10 {$current_month} next year    = " . date( "Y-m-d", strtotime( "10 {$current_month} next year", $from_timestamp ) ) );
error_log( "{$current_day} {$current_month}              = " . date( "Y-m-d", strtotime( "{$current_day} {$current_month}", $from_timestamp ) ) );
error_log( "{$current_day} {$current_month} next year    = " . date( "Y-m-d", strtotime( "{$current_day} {$current_month} next year", $from_timestamp ) ) );
error_log( "30 {$current_month}              = " . date( "Y-m-d", strtotime( "30 {$current_month}", $from_timestamp ) ) );
error_log( "30 {$current_month} next year    = " . date( "Y-m-d", strtotime( "30 {$current_month} next year", $from_timestamp ) ) );