ee.Date.difference
Zadbaj o dobrą organizację dzięki kolekcji
Zapisuj i kategoryzuj treści zgodnie ze swoimi preferencjami.
Zwraca różnicę między 2 datami w określonych jednostkach. Wynik jest liczbą zmiennoprzecinkową i oparty na średniej długości jednostki.
Wykorzystanie | Zwroty |
---|
Date.difference(start, unit) | Liczba zmiennoprzecinkowa |
Argument | Typ | Szczegóły |
---|
to: date | Data | |
start | Data | |
unit | Ciąg znaków | Jedna z wartości „year” (rok), „month” (miesiąc), „week” (tydzień), „day” (dzień), „hour” (godzina), „minute” (minut) lub „second” (sekunda). |
Przykłady
Edytor kodu (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.');
Konfiguracja Pythona
Informacje o interfejsie Python API i o używaniu pakietu geemap
do programowania interaktywnego znajdziesz na stronie
Python Environment.
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.')
O ile nie stwierdzono inaczej, treść tej strony jest objęta licencją Creative Commons – uznanie autorstwa 4.0, a fragmenty kodu są dostępne na licencji Apache 2.0. Szczegółowe informacje na ten temat zawierają zasady dotyczące witryny Google Developers. Java jest zastrzeżonym znakiem towarowym firmy Oracle i jej podmiotów stowarzyszonych.
Ostatnia aktualizacja: 2025-07-25 UTC.
[null,null,["Ostatnia aktualizacja: 2025-07-25 UTC."],[[["\u003cp\u003e\u003ccode\u003eDate.difference()\u003c/code\u003e calculates the difference between two dates, returning a floating-point number.\u003c/p\u003e\n"],["\u003cp\u003eThe difference is calculated based on the average length of the specified unit (e.g., 'year', 'month', 'week', 'day', 'hour', 'minute', or 'second').\u003c/p\u003e\n"],["\u003cp\u003eThe function takes two \u003ccode\u003eee.Date\u003c/code\u003e objects as input, representing the start and end points for the calculation.\u003c/p\u003e\n"],["\u003cp\u003eThe result is relative to the first date and can be positive or negative depending on the order of the dates.\u003c/p\u003e\n"]]],["`Date.difference` calculates the difference between two dates, returning a floating-point number based on the average length of the specified unit. The function takes a `start` date and a `unit` string ('year', 'month', 'week', 'day', 'hour', 'minute', or 'second') as arguments. The output represents the difference in the chosen unit. Examples show calculating differences in days and weeks between two dates, showcasing both JavaScript and Python implementations.\n"],null,["# ee.Date.difference\n\nReturns the difference between two Dates in the specified units; the result is floating-point and based on the average length of the unit.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|--------------------------------|---------|\n| Date.difference`(start, unit)` | Float |\n\n| Argument | Type | Details |\n|--------------|--------|-----------------------------------------------------------------------|\n| this: `date` | Date | |\n| `start` | Date | |\n| `unit` | String | One of 'year', 'month', 'week', 'day', 'hour', 'minute', or 'second'. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Demonstrates the ee.Date.difference method.\n\nvar DATE_1 = ee.Date('2020-01-01');\nvar DATE_2 = ee.Date('2020-01-15');\n\nvar diff_1 = DATE_2.difference(DATE_1, 'days');\nvar diff_2 = DATE_1.difference(DATE_2, 'weeks');\n\nprint('The difference between ',\n DATE_2,\n ' relative to ',\n DATE_1,\n ' is ',\n diff_1,\n ' days.');\n\nprint('The difference between ',\n DATE_1,\n ' relative to ',\n DATE_2,\n ' is ',\n diff_2,\n ' weeks.');\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\nDATE_1 = ee.Date('2020-01-01')\nDATE_2 = ee.Date('2020-01-15')\n\n# Format the dates as strings.\nt1 = DATE_1.format('YYYY-MM-DD').getInfo()\nt2 = DATE_2.format('YYYY-MM-DD').getInfo()\n\n# Calculate the differences between dates.\ndiff_1 = DATE_2.difference(DATE_1, 'days').getInfo()\ndiff_2 = DATE_1.difference(DATE_2, 'weeks').getInfo()\n\nprint(f'The difference between {t2} relative to {t1} is {diff_1} days.')\nprint(f'The difference between {t1} relative to {t2} is {diff_2} weeks.')\n```"]]