Use php to obtain the code for this week, last week, this month, last month, and this quarter.

Use php to get the code for the date of this week, last week, this month, last month, and this quarter. The code is as follows:
Echo date ("Ymd", strtotime ("now"), "\ n ";
Echo date ("Ymd", strtotime ("-1 week Monday"), "\ n ";
Echo date ("Ymd", strtotime ("-1 week Sunday"), "\ n ";
Echo date ("Ymd", strtotime ("+ 0 week Monday"), "\ n ";
Echo date ("Ymd", strtotime ("+ 0 week Sunday"), "\ n ";


// Date ('N') month
// Date ("w") the week of the week
// Date ("t") days of the month

Echo'
Last week:
';
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'
This 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'
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 (23, 59, 59, date ("m"), 0, date ("Y "))), "\ n ";
Echo'
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 (23, 59, 59, date ("m"), date ("t "), date ("Y"), "\ n ";

$ GetMonthDays = date ("t", mktime (0, 0, 0, date ('N') + (date ('N')-1) % 3, 1, date ("Y"); // The number of days in the current quarter before the last month
Echo'
This quarter:
';
Echo date ('Y-m-d H: I: S', mktime (0, 0, 0, date ('N')-(date ('N ') -1) % 3, 1, date ('Y'), "\ n ";
Echo date ('Y-m-d H: I: S', mktime (, 59, date ('N') + (date ('N')-1) % 3, $ getMonthDays, date ('Y'), "\ n ";