radius_strerror
Calendar
Function Reference
PHP Manual

# Date and Time Related Extensions

- Calendar
  - Introduction
  - Installing/Configuring
  - Predefined Constants
  - Calendar Functions
- Date/Time — Date and Time
  - Introduction
  - Installing/Configuring
  - Predefined Constants
  - DateTime — The DateTime class
  - DateTimeImmutable — The DateTimeImmutable class
  - DateTimeInterface — The DateTimeInterface interface
  - DateTimeZone — The DateTimeZone class
  - DateInterval — The DateInterval class
  - DatePeriod — The DatePeriod class
  - Date/Time Functions
  - Supported Date and Time Formats
  - List of Supported Timezones

radius_strerror
Calendar
Function Reference
PHP Manual