quartz-cron-checker
quartz-cron-checker is a lightweight, strict validator for Quartz-style cron expressions in Python.
It ensures all parts of the cron string conform to the Quartz cron spec—including support for special characters, named values, and mutual exclusivity of day-of-month and day-of-week.
Features
- ✅ Full support for 6- or 7-field Quartz cron expressions (
second minute hour day-of-month month day-of-week [year]) - ✅ Literal handling (
*,?,L,W,#) - ✅ Named months (
JAN,FEB, etc.) and days (MON,TUE, etc.) - ✅ Detailed error messages and exceptions
- ✅ Clean object-oriented API
- ✅ Extensible field-level validation
Installation
pip install quartz-cron-checker
Usage
Calling validate will raise an exception if the cron string is invalid. The method will return True otherwise.
from quartz_cron_checker import QuartzCronChecker
# Parse and validate a cron string
cron = QuartzCronChecker.from_cron_string("0 0 12 ? * MON-FRI")
cron.validate() # Raises if invalid
# __str__ returns the original cron string
print(cron)
>>> 0 0 12 ? * MON-FRI
# __repr__ returns a more detailed representation
print(repr(cron))
>>> <QuartzCronChecker(second=0, minute=0, hour=12, day_of_month=?, month=*, day_of_week=MON-FRI, year=None)>
You can also validate either a whole cron string or individual fields without creating an object:
from quartz_cron_checker import validate_cron_string, validate_day_of_month, validate_second
# Validate a full cron string
print(validate_cron_string("0 0 12 ? * MON-FRI"))
>>> True
print(validate_cron_string("0 0 12 ? * MON-FRI-SAT"))
>>> PatternOrLiteralMatchError: [day_of_week=MON-FRI-SAT] Part 'MON-FRI-SAT' does not match any literal (THU, FRI, MON, SAT, TUE, WED, *, SUN, ?) or allowed pattern (Range, Increment, Range with increment, List of digits, Day of week occurrence, Last day of week in month, Day of week range, Specific day of week)
# Validate individual fields
print(validate_second("0"))
>>> True
print(validate_day_of_month("13/26"))
>>> True
print(validate_day_of_month("31W"))
>>> True
print(validate_day_of_month("33W"))
>>> PatternValidatorError: [day_of_month=33W] Part '33W' matches pattern 'Nearest weekday' ('^(\d+)W$') but failed semantic validation: must be between 1 and 31
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