Python standard library datetime datetime module usage analysis details

datetime_zero = ()

datetime_first = ()

datetime_second = ()

datetime_three = (year=1, month=1, day=1, hour=0, minute=0, second=0, microsecond=1)
datetime_four = (year=9999, month=12, day=31, hour=23, minute=59, second=59, microsecond=999999)
datetime_five = (9999, 12, 31, 23, 59, 59, 999999)

print(datetime_zero, type(datetime_zero))       # 2022-07-09 18:12:43.486469 <class ''>
print(datetime_first, type(datetime_first))     # 2022-07-09 18:12:43.486469 <class ''>
print(datetime_second, type(datetime_second))   # 2022-07-09 18:12:43.486469 <class ''>
print(datetime_three, type(datetime_three))     # 0001-01-01 00:00:00.000001 <class ''>
print(datetime_four, type(datetime_four))       # 9999-12-31 23:59:59.999999 <class ''>
print(datetime_five, type(datetime_five))       # 9999-12-31 23:59:59.999999 <class ''>

print()        # 0001-01-01 00:00:00
print()        # 9999-12-31 23:59:59.999999

datetime_first = ()
"""# Get the date attribute [year-month-day] from the datetime object """"
new_time = (datetime_first)
print(new_time)
print(type(new_time))
"""# Get the time attribute [hours:minutes:seconds:microseconds] from the datetime object."""
new_time = (datetime_first)
print(new_time)
print(type(new_time))
"""# Get year from datetime object """
datetime_year = datetime_first.year
print(datetime_year, type(datetime_year))       # 2022 <class 'int'>
"""# Get month from datetime object """
datetime_month = datetime_first.month
print(datetime_month, type(datetime_month))       # 7 <class 'int'>
"""# Get days from datetime object """
datetime_day = datetime_first.day
print(datetime_day, type(datetime_day))       # 10 <class 'int'>
"""# Get hour from datetime object """
datetime_hour = datetime_first.hour
print(datetime_hour, type(datetime_hour))       # 18 <class 'int'>
"""# Get minutes from datetime objects """
datetime_minute = datetime_first.minute
print(datetime_minute, type(datetime_minute))       # 56 <class 'int'>
"""# Get seconds from a datetime object."""
datetime_second = datetime_first.second
print(datetime_second, type(datetime_second))       # 16 <class 'int'>
"""# Get microseconds from datetime objects """
datetime_microsecond = datetime_first.microsecond
print(datetime_microsecond, type(datetime_microsecond))       # 735264 <class 'int'>

UTCDateTime = (year=2022, month=7, day=10, hour=19, minute=14, second=27, microsecond=1235)
datetime_UTCTimeTuple = (UTCDateTime)
print(datetime_UTCTimeTuple, type(datetime_UTCTimeTuple))  # categorized as：<class 'time.struct_time'>

datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
datetime_ordinal = (datetime_replace)
print(datetime_ordinal, type(datetime_ordinal))     # 738345 <class 'int'>
print((1))     # 0001-01-02 00:00:00
print((2))     # 0001-01-02 00:00:00
datetime_replace_max = (year=9999, month=12, day=31, hour=23, minute=59, second=59, microsecond=999999)
print((datetime_replace_max))
print((3652060))

datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
print(datetime_replace)
ctime_datetime = (datetime_replace)
print(ctime_datetime, type(ctime_datetime))
```
![Pythonstandard librarydatetimeherdatetimeModule Details_date_07](/)
## 7. Converting datetime objects to timestamps
```python
datetime_timestamp = (datetime_replace)
print(datetime_timestamp, type(datetime_timestamp))         # 1657365267.000123 <class 'float'>
```
![Pythonstandard librarydatetimeherdatetimeModule Details_datetime_08](/)
## 8. Converting timestamps to datetime objects
```python
print((datetime_timestamp))  # 2022-07-09 19:14:27.000123
```
![Pythonstandard librarydatetimeherdatetimeModule Details_datetime_08](/)
## 9. Date-time objects converted to time tuples
```python
datetime_timetuple = (datetime_replace)
print(datetime_timetuple, type(datetime_timetuple))
```
![Pythonstandard librarydatetimeherdatetimeModule Details_datetime_08](/)
## 10. ISO standard date-time format
ISOStandard calendar time,CalendarCalendar in Chinese
* The meaning of each value is(particular year、weeks、The first of the weekNsky)assume (office)(year, week, weekday);
* weekdayThe value of the[1,7],1Delegate Monday,7Delegate Sunday
* typical example:(year=2022, week=27, weekday=7)
```python
datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
UTCDateTime = (year=2022, month=7, day=10, hour=19, minute=14, second=27, microsecond=1235)
# ISO standard date-time format
print((UTCDateTime))
# Convert datetime objects to strings in ISO standard datetime format
UTC_ISO_DateTime = (UTCDateTime)
print(UTC_ISO_DateTime, type(UTC_ISO_DateTime))         # 2022-07-10T19:14:27.001235 <class 'str'>
# Convert ISO standard datetime format strings to datetime types
From_UTC_ISO_DateTime = ('9999-12-31T23:59:59.999999')   # <class ''>
print(From_UTC_ISO_DateTime, type(From_UTC_ISO_DateTime))
# N day of the week for ISO standards
# The range of values is [1,7], 1 for Monday and 7 for Sunday.
UTC_ISO_WeekDateTime = (UTCDateTime)
print(UTC_ISO_WeekDateTime, type(UTC_ISO_WeekDateTime))     # 7 <class 'int'>
# ISO standardized calendar time, Calendar in Chinese.
# The meaning of each value is (year, week, weekday) i.e. (year, week, weekday).
# weekday value is [1,7], 1 for Monday, 7 for Sunday
# Example:(year=2022, week=27, weekday=7)
UTC_ISO_CalendarDateTime = (UTCDateTime)
print(UTC_ISO_CalendarDateTime, type(UTC_ISO_CalendarDateTime))
# Convert ISO standard calendar format strings to time-date type
From_UTC_ISO_CalendarDateTime = (year=2022, week=27, day=7)
print(From_UTC_ISO_CalendarDateTime)        # 2022-07-10 00:00:00
print(type(From_UTC_ISO_CalendarDateTime))  # <class ''>
```
![Pythonstandard librarydatetimeherdatetimeModule Details_python_11](/)
## 11, date and time replacement function replace ()
*  replace()You can replace only one of the datetime attributes
* replace()The first parameter of the function must be passed
* replace()The first argument to the function is a datetime type()target audience
* Pass parameter replacement by keyword
* parameter shift by position
```python
datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
# Initial value
print(f"datetime_replaceThe original value of：{datetime_replace}", f"The type is：{type(datetime_replace)}")
# No parameters passed
print((datetime_replace))    # 2022-07-09 19:14:27.000123
# Replace only the year
print((datetime_replace, 2019))    # 2019-07-09 19:14:27.000123
print((datetime_replace, year=2019))   # 2019-07-09 19:14:27.000123
# Replace only the month, same for other parameters.
print((datetime_replace, month=12))            # 2022-12-09 19:14:27.000123
print((datetime_replace, datetime_replace.year, 12))   # 2022-12-09 19:14:27.000123
# Replace other parameters with the same
print((datetime_replace, year=2019, month=12, day=31, hour=15,
                                minute=13, second=15, microsecond=9999))    # 2019-12-31 15:13:15.009999
```
![Pythonstandard librarydatetimeherdatetimeModule Details_date_12](/)
## 12, date time object formatting strftime()
* The commonly used formats for formatting date-time objects are as follows
* %H(Double-digit hours)
* %M(Double-digit minutes)
* %S(Two-digit seconds.)
* %f(6Microseconds of digits)
* %h(Abbreviated month names,Generally English abbreviation)
* %y(两位数的particular year)
* %Y(四位数的particular year)
* %m(Double-digit months)
* %d(两位数的sky数)
* It is possible to format only some of the attributes
```python
datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
# Can format only some of the attributes
datetime_str = (datetime_replace, "%Y-%m-%d %H:%M:%S.%f")
print(f"Formatted as：{datetime_str}", type(datetime_str))      # 2022-07-09 19:14:27.000123 <class 'str'>
# Formatting date attributes
datetime_str_date = (datetime_replace, "%Y-%m-%d")
print(f"格式化日期The value of the：{datetime_str_date}")      # 2022-07-09
# Format time attributes
datetime_str_time = (datetime_replace, "%H:%M:%S.%f")
print(f"格式化时间The value of the：{datetime_str_time}")      # 19:14:27.000123
```
![Pythonstandard librarydatetimeherdatetimeModule Details_datetime_13](/)
## Appendix, full code
```python
# coding:utf-8
import datetime
# Date-time objects
# A date-time object is an instance that has both date (year, month, day) and time (hour, minute, second) attributes
# The date-time object is of type
# Commonly used properties of the date-time object are year, month, day, hour, minute, second, microsecond, etc.
# Date-time objects can be created at a specific time, or by getting the current time.
# DateTime objects can be created by positional passes or keyword passes when creating a specified time.
# The date-time object creation functions are (), (), (), (), ()
# The date and time objects are created by () with the following parameters: year, month, day, hour, minute, second, microsecond.
# Date-time objects are created without parameters by the () function
# Date-time objects are created without parameters by the () function
# Date-time objects are created without parameters by the () function
# The date-time object should contain at least three parameters, year, month and day, when created via ()
# The date-time object is created with the following range of parameters via ()
# {year[1~9999]、month[1~12]、day[1~31]、hour[0~23]、minute[0~59]、second[0~59]、microsecond[1~999999]}

# Created by ()
datetime_zero = ()
# Created by the () function
datetime_first = ()
# Created by ()
datetime_second = ()
# Specify datetime, keyword passes through () function to create
datetime_three = (year=1, month=1, day=1, hour=0, minute=0, second=0, microsecond=1)
datetime_four = (year=9999, month=12, day=31, hour=23, minute=59, second=59, microsecond=999999)
# Specify the date and time through the () function, created by passing the parameters by location, the order is immutable and the parameter values must be within the specified range.
datetime_five = (9999, 12, 31, 23, 59, 59, 999999)
print(datetime_zero, type(datetime_zero))       # 2022-07-09 18:12:43.486469 <class ''>
print(datetime_first, type(datetime_first))     # 2022-07-09 18:12:43.486469 <class ''>
print(datetime_second, type(datetime_second))   # 2022-07-09 18:12:43.486469 <class ''>
print(datetime_three, type(datetime_three))     # 0001-01-01 00:00:00.000001 <class ''>
print(datetime_four, type(datetime_four))       # 9999-12-31 23:59:59.999999 <class ''>
print(datetime_five, type(datetime_five))       # 9999-12-31 23:59:59.999999 <class ''>
# View the largest and smallest datetime objects that datetime can handle
print()        # 0001-01-01 00:00:00
print()        # 9999-12-31 23:59:59.999999

"""# Get the date attribute [year-month-day] from the datetime object """"
new_time = (datetime_first)
print(new_time)
print(type(new_time))
"""# Get the time attribute [hours:minutes:seconds:microseconds] from the datetime object."""
new_time = (datetime_first)
print(new_time)
print(type(new_time))
"""# Get year from datetime object """
datetime_year = datetime_four.year
print(datetime_year, type(datetime_year))       # 9999 <class 'int'>
"""# Get month from datetime object """
datetime_month = datetime_four.month
print(datetime_month, type(datetime_month))       # 12 <class 'int'>
"""# Get days from datetime object """
datetime_day = datetime_four.day
print(datetime_day, type(datetime_day))       # 31 <class 'int'>
"""# Get hour from datetime object """
datetime_hour = datetime_four.hour
print(datetime_hour, type(datetime_hour))       # 23 <class 'int'>
"""# Get minutes from datetime objects """
datetime_minute = datetime_four.minute
print(datetime_minute, type(datetime_minute))       # 59 <class 'int'>
"""# Get seconds from a datetime object."""
datetime_second = datetime_four.second
print(datetime_second, type(datetime_second))       # 59 <class 'int'>
"""# Get microseconds from datetime objects """
datetime_microsecond = datetime_four.microsecond
print(datetime_microsecond, type(datetime_microsecond))       # 999999 <class 'int'>
"""# () function's arguments can only be of type """
date_time = (2022, 12, 26)
"""# Incoming parameters cannot be of type """"
"""# TypeError: descriptor 'date' for '' objects doesn't apply to a '' object"""
"""# print((date_time))"""
time_time = (12, 2, 54, 999999)
"""# Incoming parameters cannot be of type """"
"""# TypeError: descriptor 'date' for '' objects doesn't apply to a '' object"""
"""# print((time_time))"""
"""# Similarly, the () function cannot be passed parameters of type and type """"
"""# TypeError: descriptor 'time' for '' objects doesn't apply to a '' object"""
"""# print((date_time))"""
"""# TypeError: descriptor 'time' for '' objects doesn't apply to a '' object"""
"""# print((time_time))"""
# Convert datetime objects to time tuple types
# A time tuple is a tuple of objects with the year, month, day, hour, minute, second, Nth day of the week, Nth day of the year, and Daylight Saving Time flags.
# Example time tuple: (tm_year=2022, tm_mon=7, tm_mday=9, tm_hour=19, tm_min=14, tm_sec=27, tm_wday=5, tm_yday=190, tm_isdst=0)
# where tm_wday value from 0, the range is: 0 ~ 6, 0 for Monday, 6 for Sunday; tm_isdst = 0 on behalf of not enabled daylight saving time
UTCDateTime = (year=2022, month=7, day=10, hour=19, minute=14, second=27, microsecond=1235)
datetime_UTCTimeTuple = (UTCDateTime)
print(datetime_UTCTimeTuple, type(datetime_UTCTimeTuple))  # Type: <class 'time.struct_time' >
# Conversion of date-time objects into days counted from the beginning of the AD calendar
datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
datetime_ordinal = (datetime_replace)
print(datetime_ordinal, type(datetime_ordinal))     # 738345 <class 'int'>
print((1))     # 0001-01-02 00:00:00
print((2))     # 0001-01-02 00:00:00
# ctime() is to convert a datetime type to a string of values between dates, e.g. Sat Jul 9 19:14:27 2022 (Saturday, July 9, 2022)
# ctime() returns the first part of the value for the day of the week, the second part of the value for the month, the third part of the value for the day, the fourth part of the value for the time, and the fifth part of the value for the year.
print(datetime_replace)
ctime_datetime = (datetime_replace)
print(ctime_datetime, type(ctime_datetime))

# Convert datetime objects to timestamps
datetime_timestamp = (datetime_replace)
print(datetime_timestamp, type(datetime_timestamp))         # 1657365267.000123 <class 'float'>
# Convert timestamps to datetime objects
print((datetime_timestamp))  # 2022-07-09 19:14:27.000123

# Convert datetime objects to time tuples
datetime_timetuple = (datetime_replace)
print(datetime_timetuple, type(datetime_timetuple))
# ISO standard date-time format
print((UTCDateTime))
# Convert datetime objects to strings in ISO standard datetime format
UTC_ISO_DateTime = (UTCDateTime)
print(UTC_ISO_DateTime, type(UTC_ISO_DateTime))         # 2022-07-10T19:14:27.001235 <class 'str'>
# Convert ISO standard datetime format strings to datetime types
From_UTC_ISO_DateTime = ('9999-12-31T23:59:59.999999')   # <class ''>
print(From_UTC_ISO_DateTime, type(From_UTC_ISO_DateTime))
# N day of the week for ISO standards
# The range of values is [1,7], 1 for Monday and 7 for Sunday.
UTC_ISO_WeekDateTime = (UTCDateTime)
print(UTC_ISO_WeekDateTime, type(UTC_ISO_WeekDateTime))     # 7 <class 'int'>
# ISO standardized calendar time, Calendar in Chinese.
# The meaning of each value is (year, week, weekday) i.e. (year, week, weekday).
# weekday value is [1,7], 1 for Monday, 7 for Sunday
# Example:(year=2022, week=27, weekday=7)
UTC_ISO_CalendarDateTime = (UTCDateTime)
print(UTC_ISO_CalendarDateTime, type(UTC_ISO_CalendarDateTime))
# Convert ISO standard calendar format strings to time-date type
From_UTC_ISO_CalendarDateTime = (year=2022, week=27, day=7)
print(From_UTC_ISO_CalendarDateTime)        # 2022-07-10 00:00:00
print(type(From_UTC_ISO_CalendarDateTime))  # <class ''>

# Date-time replacement function replace()
# replace() can replace only one of the datetime attributes
# The first argument of the replace() function must be passed.
# The first argument to the replace() function is an object of datetime type ()
# Pass parameter replacement by keyword
# Pass the parameter body by position
datetime_replace = (year=2022, month=7, day=9, hour=19, minute=14, second=27, microsecond=123)
# Initial value
print(f"datetime_replaceThe original value of：{datetime_replace}", f"The type is：{type(datetime_replace)}")
# No parameters passed
print((datetime_replace))    # 2022-07-09 19:14:27.000123
# Replace only the year
print((datetime_replace, 2019))    # 2019-07-09 19:14:27.000123
print((datetime_replace, year=2019))   # 2019-07-09 19:14:27.000123
# Replace only the month, same for other parameters.
print((datetime_replace, month=12))            # 2022-12-09 19:14:27.000123
print((datetime_replace, datetime_replace.year, 12))   # 2022-12-09 19:14:27.000123
# Replace other parameters with the same
print((datetime_replace, year=2019, month=12, day=31, hour=15,
                               minute=13, second=15, microsecond=9999))    # 2019-12-31 15:13:15.00999
# date time object formatting strftime()
# The following formats are commonly used for date-time object formatting:
""
%H(Double-digit hours)、%M(Double-digit minutes)、%S(Two-digit seconds.)、%f(6Microseconds of digits)、%h(Abbreviated month names,Generally English abbreviation)
%y(两位数的particular year)、%Y(四位数的particular year)、%m(Double-digit months)、%d(两位数的sky数)
"""
# Can format only some of the attributes
datetime_str = (datetime_replace, "%Y-%m-%d %H:%M:%S.%f")
print(f"Formatted as：{datetime_str}", type(datetime_str))      # 2022-07-09 19:14:27.000123 <class 'str'>
# Formatting date attributes
datetime_str_date = (datetime_replace, "%Y-%m-%d")
print(f"格式化日期The value of the：{datetime_str_date}")      # 2022-07-09
# Format time attributes
datetime_str_time = (datetime_replace, "%H:%M:%S.%f")
print(f"格式化时间The value of the：{datetime_str_time}")      # 19:14:27.000123
```