Python datetime tutorial: current time, timestamps, date arithmetic, formatting, parsing, range generation, and calendar display

1. Get the current date and time

from datetime import datetime
# 获取当前的日期和时间
now = datetime.now()
print("当前的日期和时间:", now)

Output example: 当前的日期和时间: 2024-08-08 14:30:22.123456

2. Get the timestamp of a specific date

from datetime import datetime
# 将字符串转换为日期对象
date_str = "2024-08-08"
date_obj = datetime.strptime(date_str, "%Y-%m-%d")
# 转换为时间戳
timestamp = date_obj.timestamp()
print("时间戳:", timestamp)

Output example: 时间戳: 1691510400.0

3. Date addition and subtraction

from datetime import datetime, timedelta
# 当前日期
today = datetime.now().date()
# 明天的日期
tomorrow = today + timedelta(days=1)
print("明天的日期:", tomorrow)
# 一周前的日期
last_week = today - timedelta(weeks=1)
print("一周前的日期:", last_week)

Output example: 明天的日期: 2024-08-09 一周前的日期: 2024-08-01

4. Date formatting

from datetime import datetime
# 当前日期
today = datetime.now()
# 格式化日期
formatted_date = today.strftime("%Y-%m-%d %H:%M:%S")
print("格式化后的日期:", formatted_date)

Output example: 格式化后的日期: 2024-08-08 14:30:22

5. Calculate the difference between two dates

from datetime import datetime
# 创建两个日期对象
date1 = datetime(2024, 8, 8)
date2 = datetime(2024, 8, 15)
# 计算差值
delta = date2 - date1
print("两个日期之间的差值:", delta.days, "天")

Output example: 两个日期之间的差值: 7 天

6. Compare two dates

from datetime import datetime
# 创建两个日期对象
date1 = datetime(2024, 8, 8)
date2 = datetime(2024, 8, 15)
# 比较日期
if date1 < date2:
    print("date1 在 date2 之前")
else:
    print("date1 不在 date2 之前")

Output example: date1 在 date2 之前

7. Parse a date string

from datetime import datetime
# 定义日期字符串
date_str = "2024-08-08 14:30:22"
# 解析日期字符串
date_obj = datetime.strptime(date_str, "%Y-%m-%d %H:%M:%S")
print("解析后的日期对象:", date_obj)

Output example: 解析后的日期对象: 2024-08-08 14:30:22

8. Generate all dates within a range

from datetime import datetime, timedelta
# 定义开始和结束日期
start_date = datetime(2024, 8, 8)
end_date = datetime(2024, 8, 15)
# 生成日期范围内的所有日期
current_date = start_date
while current_date <= end_date:
    print(current_date.strftime("%Y-%m-%d"))
    current_date += timedelta(days=1)

Output example: 2024-08-08 2024-08-09 2024-08-10 2024-08-11 2024-08-12 2024-08-13 2024-08-14 2024-08-15

9. Determine if a date belongs to a specific month

from datetime import datetime
# 定义日期
date_obj = datetime(2024, 8, 15)
# 判断日期是否属于8月份
if date_obj.month == 8:
    print("日期属于8月份")
else:
    print("日期不属于8月份")

Output example: 日期属于8月份

10. Display a monthly calendar using the calendar module

import calendar
# 打印2024年8月份的日历
print(calendar.month(2024, 8))

Output example: August 2024 Mo Tu We Th Fr Sa Su 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31