比较两个日期相差多少秒的几种方法

[{"title":"（ 8 个子文件 187KB ） 比较两个日期相差多少秒的几种方法","children":[{"title":"比较两个日期相差多少秒的几种方法","children":[{"title":"Output","children":[{"title":"Project1.exe <span style='color:#111;'> 169.00KB </span>","children":null,"spread":false},{"title":"Project1.tds <span style='color:#111;'> 704.00KB </span>","children":null,"spread":false}],"spread":true},{"title":"Project1.res <span style='color:#111;'> 1.52KB </span>","children":null,"spread":false},{"title":"Project1.bcc32pch <span style='color:#111;'> 396B </span>","children":null,"spread":false},{"title":"Project1.bpf <span style='color:#111;'> 98B </span>","children":null,"spread":false},{"title":"tmp","children":[{"title":"Unit1.obj <span style='color:#111;'> 121.57KB </span>","children":null,"spread":false}],"spread":true},{"title":"Unit1.cpp <span style='color:#111;'> 5.99KB </span>","children":null,"spread":false},{"title":"Project1.bpr <span style='color:#111;'> 8.13KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]