Python日期时间函数库arrow

time.py

"""
pip install arrow

https://github.com/crsmithdev/arrow
"""

import arrow

utcnow = arrow.utcnow()

bjnow = arrow.now('Asia/Shanghai')
bjnow = utcnow.to('Asia/Shanghai')

bjnow.format('YYYY-MM-DD HH:mm:ss ZZ')
bjnow.floor('hour')
bjnow.floor('day')
bjnow.floor('week')
bjnow.floor('month')

bjnow.ceil('hour')
bjnow.ceil('day')
bjnow.ceil('week')
bjnow.ceil('month')

arrow.now('Asia/Shanghai').span('week')  #周一 ～ 周日
arrow.now('Asia/Shanghai').span('month')

def span(arw):
  """
  周日 ～ 周一
  """
  monday, sunday = arw.span('week')
  if arw.isoweekday() == 7:
    return monday.replace(days=6), sunday.replace(days=6)
  return monday.replace(days=-1), sunday.replace(days=-1)

three_minutes_ago = bjnow.replace(minutes=-3)
print three_minutes_ago.humanize(locale='zh_cn')

three_hours_ago = bjnow.replace(hours=-3)
print three_hours_ago.humanize(locale='zh_cn')

three_days_ago = bjnow.replace(days=-3)
print three_days_ago.humanize(locale='zh_cn')

# 指定日期时间的时区转换，考虑夏令时问题
# https://www.timeanddate.com/time/change/usa/chicago?year=2018

arrow.get("2018-03-11 15:59:59+08:00").to('America/Chicago')
#==> <Arrow [2018-03-11T01:59:59-06:00]>

arrow.get("2018-03-11 16:00:00+08:00").to('America/Chicago')
#==> <Arrow [2018-03-11T03:00:00-05:00]>

ts = arrow.get('2016-01-26T00:00:00+08:00').timestamp
arrow.get(ts).strftime('%Y-%m-%d')

arrow.get(ts).to('Asia/Shanghai').strftime('%Y-%m-%d')