java时间补零

String timeStr = "2007/8/4 00:0:00";
//自定义入参的格式化方式
DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy/M/d H:m:ss");
//将字符串格式化为LocalDateTime
LocalDateTime date = LocalDateTime.parse(timeStr, df);
//自定义目标日期的格式化方式
DateTimeFormatter f2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
//将格式化后的LocalDateTime转成字符串
String transTime = f2.format(date);
System.out.println(transTime);

https://blog.csdn.net/weixin_41197407/article/details/115616700