Specific use of PyQt5 QDate class

QDateIt is the core class for processing dates in PyQt5, used to represent Gregorian dates (year, month, day), and supports date calculation, formatting and validity verification. Suitable for date input, data filtering, schedule management and other functions in GUI development.

Core functions

• ​Date creation: Supports year, month, day or string parsing initialization.
• ​Date calculation: add or subtract days/month/years, get the date difference.
• ​Format output: Convert to string (supports localized format).
• ​Efficiency check: Automatically verify the legality of dates (such as leap years, month range).
• ​Static method: Quickly get the current date or a specific date.

Common methods and code examples

​1. Create a date object

from  import QDate

# Create a date objectdate1 = QDate(2023, 10, 1)  # October 1, 2023date2 = ("2023/12/31", "yyyy/MM/dd")  # parse from stringtoday = ()  # Current date

2. Obtain date information

print(f"{('yyyy-MM-dd')} It's week{()}")
# Output：2023-10-05 It's week4（Thursday）

​3. Date calculation and comparison

# Calculate future datesfuture_date = (3)  # Date after 3 months
# Calculate the date differencedays_remaining = (QDate(2023, 12, 31))  # Days to the end of the year

​4. Date formatting and conversion

Common formats:

• yyyy: 4-digit year (such as 2023)
• MM: Two months (01~12)
• dd: Two-digit days (01~31)
• ddd: Localized week abbreviation (such as "Monday")
• dddd: Localized full name of the week (such as "Monday")

print(("yyyy-MM-dd"))  # 2023-10-01
print(("dd/MM/yyyy"))  # 01/10/2023
print(("MMMM d, yyyy"))  # October 1, 2023（Need localization support）

​5. Date validity verification

# Verify the user input dateuser_input = QDate(2023, 13, 1)  #Invalid monthif user_input.isValid():
    print("Date valid")
else:
    print("Invalid date")

​Full example: Date calculator

from  import QDate

def date_calculator():
    today = ()
    print(f"Current date: {('yyyy-MM-dd')}")
    
    # Calculate the date after 30 days    future_date = (30)
    print(f"30The Queen of Heaven: {future_date.toString('yyyy-MM-dd')}")
    
    # Calculate the number of days between two dates    deadline = QDate(2023, 12, 31)
    days_left = (deadline)
    print(f"There is still a year-end {days_left} sky")
    
    # Verification date    test_date = QDate(2024, 2, 29)  # 2024 is a leap year    print(f"2024-02-29 Is it valid or not? {test_date.isValid()}")  # True

date_calculator()

​Things to note

• ​Moon and days range:

  • Month range: 1~12
  • Day range: Automatic verification based on the month (such as April cannot exceed 30 days).

• ​With PythondatetimeInteraction:

  • usetoPyDate()Convert toObjects for interaction with other libraries.
  • fromConversion:

    import datetime
    py_date = (2023, 10, 1)
    qt_date = QDate(py_date.year, py_date.month, py_date.day)

• Localization format:

  • The formatted output will be automatically adapted according to the system language (such as "October 1, 2023" in the Chinese environment).

ByQDate, can efficiently process date logic, combined withQDateEditThe control can build a user-friendly date input interface!

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