Python generates GMT time format and timestamp date, etc.

1. Datetime generates GMT time format

• Case: The format generated in js is as followsnew Date()+Math.random(1000)
• Right now'Sat Apr 30 2022 15:03:40 GMT+0800 (中国标准时间)0.25518323366967754'
  
• The python code is generated as follows

  from datetime import datetime
  import random
  
  gmt_format = '%a %b %d %Y %H:%M:%S GMT+0800 (中国标准时间)'
  print(datetime.now().strftime(gmt_format) + str(random.random()))
  # Sat Apr 30 2022 15:06:03 GMT+0800 (中国标准时间)0.23243302776998054
  

Two, python converts timestamp and date formatting to each other

• python format timestamp into date

  import time
  
  
  time_stamp = int(time.time())  # 10位长度时间戳
  format_time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time_stamp))
  print(format_time)  # 2022-04-30 15:15:36
  

• python convert date to timestamp

  import time
  
  
  time_arr = time.strptime('2019-06-03 21:19:03', "%Y-%m-%d %H:%M:%S")
  time_tmp = time.mktime(time_arr)  # 时间戳
  print(int(time_tmp))
  

3. Python generates a certain range of date collections

• For example, the date generated a few days ago

  import datetime
  
  
  def set_date_range(days_num):
      """
      设置日期范围
      :return:返回日期列表，类似这种：['2019-09-10', '2019-09-09', '2019-09-08']
      """
      date_range = list()
      for num in range(days_num):
          str_day = str(datetime.date.today() - datetime.timedelta(days=num))
          date_range.append(str_day)
      return date_range
  
  
  print(set_date_range(5))
  # ['2022-04-30', '2022-04-29', '2022-04-28', '2022-04-27', '2022-04-26']
  

Fourth, python generates a certain date for today/yesterday/tomorrow

• Add and subtract dates by datetime.timedelta()

  import datetime
  
  
  _days_num = 1
  _days_num = 1
  # 今天
  now_date = str(datetime.date.today())
  print(now_date)
  # 昨天
  before_date = str(datetime.date.today() - datetime.timedelta(days=_days_num))
  print(before_date)
  # 明天
  after_date = str(datetime.date.today() + datetime.timedelta(days=_days_num))
  print(after_date)
  

Five, python format the date number 42380 of excel

• Format the date format of numbers in excel

  import datetime
  
  
  def conversion_date(dates: int):
      """
      定义转化日期戳的函数,dates为excel日期数字42380
      :param dates:
      :return:
      """
      delta = datetime.timedelta(days=dates)
      # 将1899-12-30转化为可以计算的时间格式并加上要转化的日期戳
      today = datetime.datetime.strptime('1899-12-30', '%Y-%m-%d') + delta
      return datetime.datetime.strftime(today, '%Y-%m-%d')
  
  
  print(conversion_date(42380))  # 2016-01-11
  
  
  

Sixth, python compares the size of two dates

• Compare date size first format

  import datetime
  
  
  def diff_time(time_1, time_2, fmt='%Y-%m-%d'):
      """
      比较两个日期大小
      :param time_1: 日期 2019-01-11
      :param time_2: 日期 2019-01-11
      :param fmt: 日期格式
      :return: time_1 大于 time_2 则返回True
      """
      if datetime.datetime.strptime(time_1, fmt) > datetime.datetime.strptime(time_2, fmt):
          return True
      # return False
  
  
  print(diff_time('2019-01-11', '2022-01-11'))
  print(diff_time('2024-01-11', '2022-01-11'))
  

• Or convert to a timestamp to compare the size according to the previous

  import time
  
  
  time_arr = time.strptime('2019-06-03 21:19:03', "%Y-%m-%d %H:%M:%S")
  time_tmp = time.mktime(time_arr)  # 时间戳
  print(int(time_tmp))