ee.Date.difference

會傳回兩個日期之間的差異，單位為指定的單位；結果為浮點值，並根據單位的平均長度計算。

用量傳回
Date.difference(start, unit)浮點值
引數類型詳細資料
this：date日期
start日期
unit字串可以是「year」、「month」、「week」、「day」、「hour」、「minute」或「second」。

範例

程式碼編輯器 (JavaScript)

// Demonstrates the ee.Date.difference method.

var DATE_1 = ee.Date('2020-01-01');
var DATE_2 = ee.Date('2020-01-15');

var diff_1 = DATE_2.difference(DATE_1, 'days');
var diff_2 = DATE_1.difference(DATE_2, 'weeks');

print('The difference between ',
      DATE_2,
      ' relative to ',
      DATE_1,
      ' is ',
      diff_1,
      ' days.');

print('The difference between ',
      DATE_1,
      ' relative to ',
      DATE_2,
      ' is ',
      diff_2,
      ' weeks.');

Python 設定

請參閱「 Python 環境」頁面，瞭解 Python API 和如何使用 geemap 進行互動式開發。

import ee
import geemap.core as geemap

Colab (Python)

DATE_1 = ee.Date('2020-01-01')
DATE_2 = ee.Date('2020-01-15')

# Format the dates as strings.
t1 = DATE_1.format('YYYY-MM-DD').getInfo()
t2 = DATE_2.format('YYYY-MM-DD').getInfo()

# Calculate the differences between dates.
diff_1 = DATE_2.difference(DATE_1, 'days').getInfo()
diff_2 = DATE_1.difference(DATE_2, 'weeks').getInfo()

print(f'The difference between {t2} relative to {t1} is {diff_1} days.')
print(f'The difference between {t1} relative to {t2} is {diff_2} weeks.')