删除日期中的时间格式

var dateTimeString = "2022-01-01 12:34:56";
var dateString = dateTimeString.substring(0, 10);
console.log(dateString); // 输出：2022-01-01

var dateTimeString = "2022-01-01 12:34:56";
var dateString = dateTimeString.replace(/\s+\d{2}:\d{2}:\d{2}/, '');
console.log(dateString); // 输出：2022-01-01

import datetime

dateTimeString = "2022-01-01 12:34:56"
dateString = datetime.datetime.strptime(dateTimeString, "%Y-%m-%d %H:%M:%S").strftime("%Y-%m-%d")
print(dateString) # 输出：2022-01-01

import java.text.SimpleDateFormat;
import java.util.Date;

String dateTimeString = "2022-01-01 12:34:56";
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = dateFormat.parse(dateTimeString);
SimpleDateFormat dateStringFormat = new SimpleDateFormat("yyyy-MM-dd");
String dateString = dateStringFormat.format(date);
System.out.println(dateString); // 输出：2022-01-01