PHP get the time methods of last week, this week, last month, this month, this quarter, and the last quarter-PHP source code

PHP php code used to obtain the time methods of last week, this week, last month, this month, this quarter, and the last quarter

 Last week start time:
'; Echo date ("Y-m-d H: I: s", mktime (0, 0, 0, date ("m"), date ("d ") -date ("w") + 1-7, date ("Y"), "\ n"; echo date ("Y-m-d H: I: s ", mktime (23,59, 59, date (" m "), date (" d ")-date (" w ") + 7-7, date ("Y"), "\ n"; echo'
Start time of the week:
'; Echo date ("Y-m-d H: I: s", mktime (0, 0, 0, date ("m"), date ("d ") -date ("w") + 1, date ("Y"), "\ n"; echo date ("Y-m-d H: I: s ", mktime (23, 59, 59, date ("m"), date ("d")-date ("w") + 7, date ("Y "))), "\ n"; echo'
Start time of last month:
'; Echo date ("Y-m-d H: I: s", mktime (0, 0, 0, date ("m")-1, 1, date ("Y"), "\ n"; echo date ("Y-m-d H: I: s", mktime (, 59, 59, date ("m"), 0, date ("Y"), "\ n"; echo'
Start time of this month:
'; Echo date ("Y-m-d H: I: s", mktime (0, 0, 0, date ("m"), 1, date ("Y"), "\ n"; echo date ("Y-m-d H: I: s", mktime (, 59, 59, date ("m"), date ("t"), date ("Y"), "\ n "; $ season = ceil (date ('N')/3); // The quarter of the month echo'
Start time of this quarter:
'; Echo date ('Y-m-d H: I: S', mktime (0, 0, 0, $ season * 3-3 + 1,1, date ('Y'), "\ n"; echo date ('Y-m-d H: I: S', mktime (, 59, 59, $ season * 3, date ('t', mktime (0, 0, 0, $ season * 3, 1, date ("Y "))), date ('Y'), "\ n"; $ season = ceil (date ('N')/3)-1; // the first quarter of the last quarter echo'
Start time of the last quarter:
'; Echo date ('Y-m-d H: I: S', mktime (0, 0, 0, $ season * 3-3 + 1,1, date ('Y'), "\ n"; echo date ('Y-m-d H: I: S', mktime (, 59, 59, $ season * 3, date ('t', mktime (0, 0, 0, $ season * 3, 1, date ("Y "))), date ('Y'), "\ n";?>