Google Earth Engine（gee）中的Date和DateRange

Dear 丶 2021-07-26 00:01 1253阅读 0赞

**目录**

一、Date

基本用法 fromYMD()、parse()

时间单位增加：advance()

更改时间格式：format()

时间求毫秒值：millis()

提取时间范围：getRange()

提取时间单位值：get()

时间单位的比例：getFraction()

逝去时间的求取：getRelative()

时间单位的比值求取：unitRatio()

时间差值的求取：difference()

二、DateRange

基本用法：ee.DateRange()

无限时间段：unbounded()、contains()

时间段取交集：intersection()

时间段取起、止时间：start()、end()

时间段的内容检测：isEmpty()、isUnbounded()

--------------------

# 一、Date  #

## 基本用法 fromYMD()、parse() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70][]

print(ee.Date('1970-01-01'))
    print(ee.Date(24*60*60*1000))
    print(ee.Date.fromYMD(2015,2,12))//,表示2月需用2，不能用02
    print(ee.Date.parse( 'yyyy-MM-dd-HH-mm-ss','2015-1-12-15-4-12' ))

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 1][]

print("ee.Date('2015-12-31'):", ee.Date('2015-12-31'));
    
    print('Date.now():',  Date.now());// JavaScript方法，不是Earth Engine方法 
    
    print('ee.Date(now):', ee.Date(Date.now()));
    
    
    print('ee.Date.fromYMD(2017, 1, 13):', ee.Date.fromYMD(2017, 1, 13));
    
    var theDate = ee.Date.fromYMD({
      day: 13,
      month: 1,
      year: 2017
    });//可以按名称、按任何顺序传递参数
    print('theDate:', theDate);

那么，这里可以根据日期过滤影像

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 2][]

var modis = ee.ImageCollection("MODIS/006/MOD09A1");
    
    var imgs1=modis.filterDate('2015-01-01', '2015-02-01')
    print("imgs1:",imgs1)
    
    var imgs2=modis.filterDate(ee.Date('2015-01-01'),ee.Date('2015-02-01'))
    print("imgs2:",imgs2)
    
    
    var date_start = ee.Date.fromYMD({
      day: 1,
      month: 1,
      year: 2015
    });
    
    var date_end = ee.Date.fromYMD({
      year: 2015,
      month:2,
      day: 1
    });
    
    var imgs_filterDate = modis.filterDate(date_start, date_end);
    print('imgs_filterDate:', imgs_filterDate);

## 时间单位增加：advance() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 3][]

var Date_0 = ee.Date( '1970-01-01' );
    var Date_1 = Date_0.advance( 1, 'year' );
    var Date_2 = Date_0.advance( 1, 'month' );
    var Date_3 = Date_0.advance( 1, 'week' );
    var Date_4 = Date_0.advance( 1, 'day' );
    var Date_5 = Date_0.advance( 1, 'hour' );
    var Date_6 = Date_0.advance( 1, 'minute' );
    var Date_7 = Date_0.advance( 1, 'second' );
    
    print("Date_0",Date_0)
    print(Date_1, Date_2,Date_3,Date_4,Date_5,Date_6,Date_7);

## 更改时间格式：format() ##

![20201124111928477.png][]

var date = ee.Date.fromYMD( 2015, 1, 12 );
    var date_format = date.format('MM-dd-yyyy' );
    print( date, date_format );

## 时间求毫秒值：millis() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 4][]

print(ee.Date.parse( 'yyyy-MM-dd-HH-mm-ss','1970-01-01-00-00-01'));
    print(ee.Date.parse( 'yyyy-MM-dd-HH-mm-ss','1970-01-01-00-00-01').millis());
    print(ee.Date.parse( 'yyyy-MM-dd-HH-mm-ss','1970-01-01-00-00-02').millis());

## 提取时间范围：getRange() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 5][]

print(ee.Date( '2000-05-20' ));
    print(ee.Date( '2000-05-20' ).getRange('year'));
    print(ee.Date( '2000-05-20' ).getRange('month'));
    print(ee.Date( '2000-05-20' ).getRange('day'));

## 提取时间单位值：get() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 6][]

print(ee.Date( '2000-05-20' ));
    print(ee.Date( '2000-05-20' ).get('year'));
    print(ee.Date( '2000-05-20' ).get('month'));
    print(ee.Date( '2000-05-20' ).get('day'));

## 时间单位的比例：getFraction() ##

![20201124140933311.png][]

print(ee.Date( '2000-05-28' ));
    print(ee.Date( '2000-05-28' ).getFraction('year'));
    print((31+28+31+30+28)/366)

## 逝去时间的求取：getRelative() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 7][]

print(ee.Date( '2000-05-20' ).getRelative( 'day','month' ))//这个月过了多少天
    print(ee.Date( '2000-05-20' ).getRelative( 'day','year' ))//今年过了多少天
    print(ee.Date( '2000-05-20' ).getRelative( 'month','year' ))//今年过了几个月
    print(ee.Date( '2000-05-20' ).getRelative( 'hour','year' ))//今年过了几个小时

## 时间单位的比值求取：unitRatio() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 8][]

print( ee.Date.unitRatio( 'day', 'year' ),1/365 );
    print( ee.Date.unitRatio( 'month', 'year' ),1/12 );
    print( ee.Date.unitRatio( 'day', 'month' ),1/31 );
    print( ee.Date.unitRatio( 'hour', 'day' ),1/24 );
    print( ee.Date.unitRatio( 'minute', 'hour' ),1/60 );
    print( ee.Date.unitRatio( 'second', 'minute' ),1/60 );

## 时间差值的求取：difference() ##

![2020112415034459.png][]

print(ee.Date( '2005-01-01').difference(ee.Date( '2000-01-01'),"year"))
    print(ee.Date( '2005-01-01').difference(ee.Date( '2000-01-01'),"month"))
    print(ee.Date( '2005-01-01').difference(ee.Date( '2000-01-01'),"day"))

# 二、DateRange #

## 基本用法：ee.DateRange() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 9][]

## 无限时间段：unbounded()、contains() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 10][]

## 时间段取交集：intersection() ##

![20201124151226770.png][]

var date1=ee.DateRange('2000-01-01','2015-1-1')
    var date2=ee.DateRange('2005-01-01','2020-1-1')
    
    print(date1,date2,date2.intersection(date1))

## 时间段取起、止时间：start()、end() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 11][]

print(ee.DateRange('2000-01-01','2015-1-1'))
    print(ee.DateRange('2000-01-01','2015-1-1').start())
    print(ee.DateRange('2000-01-01','2015-1-1').end())

## 时间段的内容检测：isEmpty()、isUnbounded() ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 12][]

print(ee.DateRange('2000-01-01','2015-1-1'))
    
    print(ee.DateRange('2000-01-01','2015-1-1').isEmpty())
    print(ee.DateRange('2000-01-01','2015-1-1').isUnbounded())
    
    print(ee.DateRange('2015-1-1','2000-01-01').isEmpty())
    print(ee.DateRange('2015-1-1','2000-01-01').isUnbounded())
    
    print(ee.DateRange('2000-01-01'))
    print(ee.DateRange('2000-01-01').isEmpty())
    print(ee.DateRange('2000-01-01').isUnbounded())

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[20201124140933311.png]: https://img-blog.csdnimg.cn/20201124140933311.png
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