Dev tools · alternatives · 2026

24 alternatives to A fast ISO8601 date-time parser for Python

ciso8601 is a Python library for parsing ISO8601 date-time strings. It is designed for developers who need faster date-time conversion in their applications. The tool was created to address performance bottlenecks in… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. A fast ISO8601 date-time parser for Python launched in 2014; newer entries below may have overtaken it.

1. 1
   Prometeo – a Python-to-C transpiler for high-performance computing▲166

   An experimental Python-to-C transpiler and domain specific language for embedded high-performance computing - zanellia/prometeo

   2021 · github.com · its alternatives →

2. 2
   High-precision date/time in SQLite▲274

   A rich set of functions for working with date, time and durations.

   2024 · antonz.org · its alternatives →

3. 3DO
   Duckling – Open-source datetime expression parsing▲136

   2014 · duckling-lib.org · its alternatives →

4. 4
   Codate▲265

   Easy date formats for any code

   2024 · codate.io · its alternatives →

5. 5
   Easy Python Time Parsing▲21

   I recently build a python time-parser that can parse most formats in a single line. Might be useful to some here. (Also happy to hear feedback and feature requests)

   2025 · github.com · its alternatives →

6. 6
   Fast 2kB date library alternative to Moment.js with the same API▲122

   ⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API - iamkun/dayjs

   2018 · github.com · its alternatives →

7. 7
   tu – Convert natural language date/time to UTC▲83

   CLI tool to convert a natural language date/time string to UTC - ad-si/tu

   2024 · github.com · its alternatives →

8. 8
   Duckling▲64

   Datetime expression parser (opensource)

   2014 · its alternatives →

9. 9
   AnyDate API▲7

   Universal date & time parsing API

   2025 · anydateapi.up.railway.app · its alternatives →

10. 10AL
    a lexer, parser, interpreter and web runtime (np, a 5-weekend project)▲122

    2013 · np-lang.org · its alternatives →

11. 11
    Durat.io▲119

    2015 · durat.io · its alternatives →

12. 12
    UTC Time - live clock, ISO 8601, Unix timestamp▲26

    Live UTC clock with one-click copy for ISO 8601, RFC 3339, RFC 2822 and Unix time, a device clock-skew check, and get-the-time-now code for 14 languages. Dark, fast, no signup.

    Aug 2026 · utctime.app · its alternatives →

13. 13
    128-bit, roughly-ordered, URL-safe UUIDs▲205

    Timeflake is a 128-bit, roughly-ordered, URL-safe UUID. - anthonynsimon/timeflake

    2021 · github.com · its alternatives →

14. 14
    RapidFuzz – A fast string matching library for Python▲134

    Rapid fuzzy string matching in Python using various string metrics - rapidfuzz/RapidFuzz

    2020 · github.com · its alternatives →

15. 15
    Paste A Date▲83

    Quickly convert timestamps into other timezones

    2017 · its alternatives →

16. 16
    Pyper – Concurrent Python Made Simple▲156

    Hello and happy new year! We're excited to introduce the Pyper package for concurrency & parallelism in Python. Pyper is a flexible framework for concurrent / parallel data processing, following the functional paradigm. Source code can be found on [github](https://github.com/pyper-dev/pyper) Key features: Intuitive API: Easy to learn, easy to think about. Implements clean abstractions to seamlessly unify threaded, multiprocessed, and asynchronous work. Functional Paradigm: Python functions are the building blocks of data pipelines. Let's you write clean, reusable…

    2025 · github.com · its alternatives →

17. 17
    High-speed UTF-8 validation in Rust▲127

    SIMD-accelerated UTF-8 validation for Rust. Contribute to rusticstuff/simdutf8 development by creating an account on GitHub.

    2021 · github.com · its alternatives →

18. 18
    Python JSON library in Rust, faster than ujson▲40

    Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy - ijl/orjson

    2018 · github.com · its alternatives →

19. 19
    RustPython for FreeDOS with W2c2▲34

    A Python Interpreter written in Rust. Contribute to coolcoder613eb/RustPython development by creating an account on GitHub.

    2023 · github.com · its alternatives →

20. 20
    PyCParser, C parser and interpreter in Python▲112

    C parser and interpreter written in Python with automatic ctypes interface generation - PyCParser/README.md at master · albertz/PyCParser

    2019 · github.com · its alternatives →

21. 21
    Robyn – A fast, extensible async Python web server with a Rust runtime▲103

    Robyn is a Super Fast Async Python Web Framework with a Rust runtime. - sparckles/Robyn

    2023 · github.com · its alternatives →

22. 22
    Summarize your time availability in seconds▲109

    Simple tool to share your availability as plain text. Select time slots, convert timezones, copy and send. No calendar links needed.

    2020 · whattime.today · its alternatives →

23. 23
    Natural Language Earley Parser Algorithm in Python▲14

    2017 · github.com · its alternatives →

24. 24
    ADTK – new Python library for time series anomaly detection▲67

    A Python toolkit for rule-based/unsupervised anomaly detection in time series - arundo/adtk

    2019 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →