Php get the time methods of last week, this week, last month, this month, this quarter, and the last quarter

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 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";?>

Php two dates minus the number of days: