python datetime 时间格式转换

1、字符串转时间datetime.strptime

import datetime

datetime.datetime.strptime('2020-08-1 ', "%Y-%m-%d")
datetime.datetime.strptime('2020-08-1 23:30:59', "%Y-%m-%d %H:%M:%S")

2、时间转字符串 datetime.strftime

import datetime

current_time = datetime.datetime.now()  # 获取当前时间 datetime
datetime.datetime.strftime(current_time, "%Y-%m-%d %H:%M:%S")

注：对于UTC时间字符串,时间转换格式%Y-%m-%dT%H:%M:%SZ

import datetime

utc_time_string = "2021-08-01T12:34:56Z"
utc_datetime = datetime.datetime.strptime(utc_time_string, "%Y-%m-%dT%H:%M:%SZ")

3、获取datetime(时间类型)的某粒度时间（年/月/日/时/分/秒）：

import datetime

current_time = datetime.datetime.now()

_year = current_time.year
_month = current_time.month
_day = current_time.day
_hour = current_time.hour
_minute = current_time.minute
_second = current_time.second

4、两个datetime的时间差（年/月/日/时/分/秒）

import datetime

# 给定日期字符串
date_str = '2023-10-17 01:05:16'

# 将日期字符串转换为 datetime 对象
given_date = datetime.datetime.strptime(date_string, '%Y-%m-%d %H:%M:%S')

# 获取今天的日期
current_time = datetime.datetime.now()
time_difference = current_time - given_date


# 相差秒数
time_difference.seconds

# 相差分钟数
time_difference.seconds/60

# 相差天数
time_difference.days

# 相差的月数
month_mun = (given_date.year - current_time.year)*12 + (given_date.month - current_time.month)

5、计算年龄（年为单位）

# 变量接上第4点

if current_time.month > given_date.month or (current_time.month == given_date.month and current_time.day > given_date.day):
  age = current_time.year - given_date.year
else:
  age = current_time.year - given_date.year - 1