PHP time function (time, date) usage reference

$t=time();
echo date("Y-m-d H:i:s",$t);

The format of the first parameter indicates: a - "am" or "pm" A - "AM" or "PM" d - day, two digits, if there are less than two digits, add zeros in front; for example: "01" to "31" D - Day of the week, three English letters; e.g.: "Fri" F - month, full English name; such as: "January" h - hour in 12-hour clock; e.g.: "01" to "12" H - hour in 24-hour format; e.g.: "00" to "23" g - hour in 12-hour format, no zeros are added if there are less than two digits; for example: "1" to 12" G - hour in 24-hour format, no zeros are added if there are less than two digits; for example: "0" to "23" i - minute; e.g.: "00" to "59" j - day, two digits, if there are less than two digits, do not add zero; for example: "1" to "31" l - day of the week, full English name; such as: "Friday" m - month, two digits, if there are less than two digits, add zeros in front; for example: "01" to "12" n - month, two digits, if there are less than two digits, no zero will be added; for example: "1" to "12" M - month, three English letters; such as: "Jan" s - seconds; e.g.: "00" to "59" S - add an English ordinal number at the end of the word, two English letters; such as: "th", "nd" t - the number of days in the specified month; for example: "28" to "31" U - Total seconds w - Numeric day of the week, such as: "0" (Sunday) to "6" (Saturday) Y - year, four digits; for example: "1999" y - year, two digits; such as: "99" z - day of the year; e.g.: "0" to "365" Other characters not listed above will be listed directly