fuzzy-date

fuzzy-date

Python module to convert various time strings into datetime objects, written in Rust.

Date conversion

import fuzzydate as fd

# If current time is April 1st 2023 12PM UTC...

fd.to_datetime('1 hour ago')             # 2023-04-01 11:00:00+00:00
fd.to_datetime('last week')              # 2023-03-20 12:00:00+00:00
fd.to_datetime('-1 week')                # 2023-03-25 12:00:00+00:00
fd.to_datetime('last week midnight')     # 2023-03-20 00:00:00+00:00
fd.to_datetime('-1d 2h 5min 10s')        # 2023-03-31 09:54:50+00:00
fd.to_datetime('tomorrow')               # 2023-04-02 00:00:00+00:00
fd.to_datetime('prev Monday')            # 2023-03-27 00:00:00+00:00
fd.to_datetime('prev June')              # 2022-06-01 00:00:00+00:00
fd.to_datetime('last day of this month') # 2023-04-30 00:00:00+00:00

# Anything invalid raises a ValueError

fd.to_datetime('next Summer')
# ValueError: Unable to convert "next Summer" into datetime

Time duration

Duration seconds

import fuzzydate as fd

fd.to_seconds('1h 4min') # 3840.0
fd.to_seconds('+2 days') # 172800.0
fd.to_seconds('-1 hour') # -3600.0
fd.to_seconds('1 week')  # 604800.0

# Anything other than an exact length of time raises a ValueError

fd.to_seconds('last week')
# ValueError: Unable to convert "last week" into seconds

# Because years and months have varying amount of seconds, using 
# them raises a ValueError

fd.to_seconds('1m 2w 30min')
# ValueError: Converting months into seconds is not supported

Duration string

import fuzzydate as fd

fd.to_duration(3840.0)                       # 1hr 4min
fd.to_duration(3840.0, units='long')         # 1 hour 4 minutes
fd.to_duration(3840.0, units='short')        # 1h 4min
fd.to_duration(3840.0, max'min', min='min')  # 64min

Localization

import fuzzydate as fd

fd.config.add_tokens({
    'måndag': fd.token.WDAY_MON,
    'dagar': fd.token.LONG_UNIT_DAY,
})

fd.config.add_patterns({
    'nästa [wday]': fd.pattern.NEXT_WDAY,
})

assert fd.to_date('next Monday') == fd.to_date('nästa Måndag')
assert fd.to_date('+5 days') == fd.to_date('+5 dagar')
assert fd.to_seconds('+5 days') == fd.to_seconds('+5 dagar')

fd.config.units = {
    fd.unit.DAY: 'dag',
    fd.unit.DAYS: 'dagar',
}

assert fd.to_duration(86400.0) == '1 dag'

Requirements

• Python >= 3.9

Installation

pip install fuzzy-date 

Syntax support

Special

• Date now, today, tomorrow, yesterday
• Time of day midnight

Relative

• Adjustment last, prev, this, next or +, -
• Units next week, next month, next year
• Weekdays next Mon, next Monday
• Months next Jan, next January
• Numeric (s)ec, min, (h)r, (d)ay, (w)eek, (m)onth, (y)ear
• Ranges last/first day of

Fixed

• Unix timestamp @1680307200
• Dates 2023-04-01, 04/01/2023, 01.04.2023
• Textual dates April 1st 2023, April 1 2023, 1 April 2023
• Day and month April 1st, April 1, 1 April, 1st of April
• Datetime formats 2023-04-01 12:00, 2023-04-01 12:00:00, 2023-04-01 12:00:00.410
• Time of day 2pm, 2:00 pm

Methods

Conversion

fuzzydate.to_date(
    source: str,
    today: datetime.date = None,
    weekday_start_mon: bool = True) -> datetime.date

fuzzydate.to_datetime(
    source: str,
    now: datetime.datetime = None,
    weekday_start_mon: bool = True) -> datetime.datetime
    
fuzzydate.to_duration(
    seconds: float, 
    units: str = None, 
    max: str = 'w', 
    min: str = 's') -> str
    
fuzzydate.to_seconds(
    source: str) -> float

Configuration

# Read-only
fuzzydate.config.patterns: dict[str, str]
fuzzydate.config.tokens: dict[str, int]

# Read-write
fuzzydate.config.units: dict[str, str]
fuzzydate.config.units_long: dict[str, str]
fuzzydate.config.units_short: dict[str, str]

fuzzydate.config.add_patterns(
    tokens: dict[str, str]) -> None

fuzzydate.config.add_tokens(
    tokens: dict[str, int]) -> None

Background

This library was born out of the need to accept various user inputs for date range start and end times, to convert user time tracking entries into exact durations etc. All very much alike to what timelib does.

Other implementations are available, but I did not find one that would have worked for me - usually they were missing support for some key wording I needed, or handled user vagueness and timezones in a different way.

Also, I kinda wanted to learn Rust via some example project as well.

License

MIT