天数差计算

话不多说，直接上代码。

---

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Timers;

/// <summary>
///  天数判断
/// </summary>
public class TimeData : MonoBehaviour {

    /// <summary>
    ///  天数差
    /// </summary>
    private int number = 0;
    private void Start()
    {
        // 计算天数差
        number = DateDiff("01/01/2018", DateTime.Now);
        Debug.Log(number.ToString() + "天");
    }

    /// <summary>
    ///  日期差异
    /// </summary>
    /// <param name="dateStart">开始日期</param>
    /// <param name="dateEnd">结束日期</param>
    /// <returns></returns>
    private static int DateDiff(string dateStart,DateTime dateEnd)
    {
        DateTime start = Convert.ToDateTime(dateStart);
        DateTime end = Convert.ToDateTime(dateEnd.ToShortDateString());
        // 计算时间间隔
        TimeSpan sp = end.Subtract(start);
        return sp.Days;
    }

    private void Update()
    {
        if (number >= 30)
        {
            // 如果天数相差大于30天
            // TODO
        }
    }

}