pandas之to_datetime时区转换
from datetime import date, datetime, timedelta
import time
import pandas as pd
from pandas.tseries.offsets import Hour, Minute, Second
print(time.localtime()) # time.struct_time(tm_year=2019, tm_mon=11, tm_mday=12, tm_hour=18, tm_min=34, tm_sec=52, tm_wday=1, tm_yday=316, tm_isdst=0)
print(datetime.now().timestamp()) # 1573554892.416593 带小时分秒的
print(datetime.now().tzinfo) # None
print(datetime.now().timetz()) # 18:34:52.416593
print(datetime.now().date()) # 2019-11-12
print(datetime.now()) # 2019-11-12 18:34:52.416593
# date
fixdate = date.today()+timedelta(days=-1)
# date convert to datetime
dtt = datetime(fixdate.year, fixdate.month, fixdate.day)
print(dtt) # 2019-11-11 00:00:00
print(dtt.tzinfo) # None 默认没有时区信息
s_ts = dtt.timestamp() # 1573401600.0 UTC时间戳
print('------------------pd.to_datetime--------------------------')
# pandas需要自己处理时区问题,默认没有时区信息，可以先本地化tz_localize时区再转换成tz_convert目标时区
pddt = pd.to_datetime(s_ts, utc=True, unit='s')
print(pddt.tzinfo) # UTC
print(pddt.timestamp()) # 1573401600.0
print(pddt) # 2019-11-10 16:00:00+00:00
pddt = pd.to_datetime(s_ts, utc=False, unit='s')
print(pddt.tzinfo) # None
print(pddt.timestamp()) # 1573401600.0
print(pddt) # 2019-11-10 16:00:00
pddt = pd.to_datetime(s_ts, utc=False, unit='s').tz_localize('Asia/Shanghai') # 本地化成某个时区
print(pddt.tzinfo) # Asia/Shanghai
print(pddt.timestamp()) # 1573372800.0
print(pddt) # 2019-11-10 16:00:00+08:00
pddt = pd.to_datetime(s_ts, utc=True, unit='s').tz_convert('Asia/Shanghai') # 转换成某个时区
print(pddt.tzinfo) # Asia/Shanghai
print(pddt.timestamp()) # 1573401600.0
print(pddt) # 2019-11-11 00:00:00+08:00
print('--------------------Hour(23) + Minute(59) + Second(59) --------------------------')
sec = Hour(23) + Minute(59) + Second(59)
print(sec.freqstr) # 86399S 秒，结束带个S
pddt = pd.to_datetime(s_ts+int(sec.freqstr[:-1]), utc=True, unit='s').tz_convert('Asia/Shanghai')
print(pddt) # 2019-11-11 23:59:59+08:00
print(pddt.timestamp()) # 1573487999.0
# 这样算本来才是真正想要的目标时间戳，推荐使用这种方式
dtt_hms = (dtt + Hour(23) + Minute(59) + Second(59)).tz_localize('Asia/Shanghai').tz_convert('utc').value/1000000000
print(dtt_hms) # 1573487999.0 2019-11-11 23:59:59+08:00
# 这样算出为是目标时间多了8小时的时间戳
dtt_hms = (dtt + Hour(23) + Minute(59) + Second(59)).value/1000000000
print(dtt_hms) # 1573516799.0 2019-11-12 07:59:59
exit(0)
