Unix timestamps and timezones
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Explanation:
%$d = strtotime('2018-03-07 20:48 America/Toronto');%
%$d = |ef2929|1394243280|; // string is turned into a number%
%echo date('Y-m-d', 1394243280), "\n";%
Number is converted to a date/time string using the *default* timezone:
%"2018-03-08" |555753|(01:48:21 Europe/London)|%