Python Basic Time conversion

Time Conversion

When processing time in Python, the most common is the conversion between the character form and the timestamp. Put the most basic conversions down here.

String--Timestamp

import timeimport dateutil.parser as dateparserdef str_to_timestamp(time_str)    dt = dateparser.parse(time_str)    # OR: dt = time.strptime(datetimestring, fmt)    return time.mktime(dt.timetuple())datetimestring = ‘Fri, 08 Jun 2012 22:40:26 GMT‘str_to_timestamp(datetimestring)

Timestamp, string

import timedef timestamp_to_str(ts, fmt=‘%Y-%m-%d %H:%M:%S‘):    return time.strftime(fmt, time.localtime(timestamp))timestamp = time.time()timestamp_to_str(timestamp)

Python built-in time data structure

Python internally uses a data structure similar to Namedtuple to store time. This data structure has 9 fields that can be accessed with a numeric subscript or by name.

time.struct_time(        tm_year=2014,        tm_mon=9,        tm_mday=1,        tm_hour=9,        tm_min=0,        tm_sec=0,        tm_wday=0,    # 星期几, 0~6        tm_yday=244,  # 本年的第几天, 1~366        tm_isdst=0    # 是否夏令时        )

Timestamp's Notes

Here is a small detail, the time stamp is based on the standard Time zone, and Beijing time has 8 hours of jet lag. This difference can be time.timezone obtained by obtaining the number of seconds between the standard time zone and the local time zone. For Beijing time, this value is-28800 (8*3600). So, when we take the timestamp to 86400 (the number of seconds in a day) to get the number of seconds from 0 o'clock, there will be a difference of 8 hours. Other words

time.mktime(dateparser.parse(‘2014-09-01 09:00:00‘).timetuple()) % 86400

Will output 3600, just 8 hours from 9 o'clock in the morning.

Python Basic Time conversion