object(DateTime)#2 (3) {
  ["date"]=>
  string(26) "2015-01-01 00:00:00.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(14) "Asia/Chongqing"
}
string(19) "2015-01-01 00:00:00"
object(DateTime)#3 (3) {
  ["date"]=>
  string(26) "2026-10-04 13:12:03.710354"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(14) "Asia/Chongqing"
}
string(19) "2026-10-04 13:12:03"