python moment 时间处理（较为灵活的时间运算）

墨蓝 2022-11-21 14:54 236阅读 0赞

import moment
    from datetime import datetime
    
    # Create a moment from a string
    moment.date("12-18-2012", "M-D-YYYY")
    
    # Create a moment with strftime format
    moment.date("12-18-2012", "%m-%d-%Y")
    
    # By default, the "%Y-%m-%d" strftime format is used
    moment.date("2012-12-18")
    
    # Create a moment from the current datetime
    moment.now()
    
    # The moment can also be UTC-based
    moment.utcnow()
    
    # Create a moment with the UTC time zone
    moment.utc("2012-12-18", "YYYY-M-D")
    
    # Create a moment from a Unix timestamp
    moment.unix(1355875153626)
    
    # Create a moment from a Unix UTC timestamp
    moment.unix(1355875153626, utc=True)
    
    # Return a datetime instance
    moment.date(2012, 12, 18).date
    
    # We can do the same thing with the UTC method
    moment.utc(2012, 12, 18).date
    
    # Create and format a moment using Moment.js semantics
    moment.now().format("YYYY-M-D")
    
    # Create and format a moment with strftime semantics
    moment.date(2012, 12, 18).strftime("%Y-%m-%d")
    
    # Update your moment's time zone
    moment.date(datetime(2012, 12, 18)).locale("US/Central").date
    
    # Alter the moment's UTC time zone to a different time zone
    moment.utcnow().timezone("US/Eastern").date
    
    # Set and update your moment's time zone. For instance, I'm on the
    # west coast, but want NYC's current time.
    moment.now().locale("US/Pacific").timezone("US/Eastern")
    
    # In order to manipulate time zones, a locale must always be set or
    # you must be using UTC.
    moment.utcnow().timezone("US/Eastern").date
    
    # You can also clone a moment, so the original stays unaltered
    now = moment.utcnow().timezone("US/Pacific")
    future = now.clone().add(weeks=2)

## Chaining ##

Moment allows you to chain commands, which turns out to be super useful.

# Customize your moment by chaining commands
    moment.date(2012, 12, 18).add(days=2).subtract(weeks=3).date
    
    # Imagine trying to do this with datetime, right?
    moment.utcnow().add(years=3, months=2).format("YYYY-M-D h:m A")
    
    # You can use multiple keyword arguments
    moment.date(2012, 12, 19).add(hours=1, minutes=2, seconds=3)
    
    # And, a similar subtract example...
    moment.date(2012, 12, 19, 1, 2, 3).subtract(hours=1, minutes=2, seconds=3)
    
    # In addition to adding/subtracting, we can also replace values
    moment.now().replace(hours=5, minutes=15, seconds=0).epoch()
    
    # And, if you'd prefer to keep the microseconds on your epoch value
    moment.now().replace(hours=5, minutes=15, seconds=0).epoch(rounding=False)
    
    # Years, months, and days can also be set
    moment.now().replace(years=1984, months=1, days=1, hours=0, minutes=0, seconds=0)
    
    # Also, datetime properties are available
    moment.utc(2012, 12, 19).year == 2012
    
    # Including plural ones (since I'm bad at remembering)
    moment.now().seconds
    
    # We can also manipulate to preferred weekdays, such as Monday
    moment.date(2012, 12, 19).replace(weekday=1).strftime("%Y-%m-%d")
    
    # Or, this upcoming Sunday
    moment.date("2012-12-19").replace(weekday=7).date
    
    # We can even go back to two Sundays ago
    moment.date(2012, 12, 19).replace(weekday=-7).format("YYYY-MM-DD")
    
    # It's also available as a property
    moment.utcnow().weekday
    
    # And, there's an easy way to zero out the hours, minutes, and seconds
    moment.utcnow().zero