Pendulum is a drop-in replacement for the standard datetime class, providing an alternative API. As it inherits from the standard datetime all datetime instances can be replaced by Pendulum instances.

The main purpose of this package is to provide more complex arithmetic operations on dates/times. Heavy use is made of the relativedelta type from the dateutil library. Much of this package is just a light wrapper on top of this with some added features such as range generation and business day calculation.

Countdown provides a fancy text display while it counts down to zero from a starting point you provide. The user can pause and resume the countdown from the text user interface.

The package ciso8601 converts ISO 8601 or RFC 3339 date time strings into Python datetime objects.

This package aims to make the transition away from pytz easier. It is intended for temporary usage only, and should allow you to drop your dependency on pytz while also giving your users notice that eventually you will remove support for the pytz-specific interface.

This library brings the Olson tz database into Python. It allows accurate and cross platform timezone calculations using Python 2.4 or higher. It also solves the issue of ambiguous times at the end of daylight saving time. Almost all of the Olson timezones are supported.

Termdown provides a fancy text display while it counts down to zero from a starting point you provide. The user can pause and resume the countdown from the text user interface. It can also be used in stop watch mode which counts forward or for just showing the current time.

This package provides functionality for utilizing the relativedelta feature from the dateutil library, ensuring calendar precision with aniso8601.

Python-isodate is a python module for parsing and formatting ISO 8601 dates, time and duration.

Time is a command that displays information about the resources that a program uses. The display output of the program can be customized or saved to a file.

This is a python package for looking up the corresponding timezone for given coordinates on earth entirely offline.

rdate connects to an RFC 868 time server over a TCP/IP network, printing the returned time and/or setting the system clock.

This package includes the necessary headers for using LinuxPPS PPSAPI kernel interface in user-space applications, and several support tools.

This small Python module parses various kinds of time expressions.

The dateutil module provides powerful extensions to the standard datetime module, available in Python 2.3+.

tz helps you schedule things across time zones. It is an interactive TUI program that displays time across a few time zones of your choosing.

Crypt::OpenSSL::RSA does RSA encoding and decoding (using the OpenSSL libraries).

p11-kit provides a way to load and enumerate PKCS#11 modules. It provides a standard configuration setup for installing PKCS#11 modules in such a way that they are discoverable. It also solves problems with coordinating the use of PKCS#11 by different components or libraries living in the same process.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols. It is provided in the form of a C library to support the protocols, as well as to parse and write X.509, PKCS #12, OpenPGP and other required structures.

This module offers some high level convenience functions for accessing web pages on SSL servers (for symmetry, the same API is offered for accessing http servers, too), an sslcat() function for writing your own clients, and finally access to the SSL api of the SSLeay/OpenSSL package so you can write servers or clients for more complicated applications.

mbed TLS, formerly known as PolarSSL, makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

Certbot automatically receives and installs X.509 certificates to enable Transport Layer Security (TLS) on servers. It interoperates with the Let’s Encrypt certificate authority (CA), which issues browser-trusted certificates for free.

Crypt::OpenSSL::Bignum provides multiprecision integer arithmetic in Perl.

LibreSSL is a version of the TLS/crypto stack, forked from OpenSSL in 2014 with the goals of modernizing the codebase, improving security, and applying best practice development processes. This package also includes a netcat implementation that supports TLS.