public DateFormat::getCacheTagsToInvalidate()

The maximum time in seconds that this string may be cached. Let's say the time difference is 1 day 1 hour. In this case, we can cache it until

public static DateHelper::weekDaysAbbr1($required = FALSE)

public static DateTimePlus::createFromFormat($format, $time, $timezone

An array of errors encountered when creating this date. File core/lib/Drupal/Component/Datetime/DateTimePlus

A RFC7231 Compliant date. http://tools.ietf.o

public static DateHelper::daysInYear($date = NULL)

The value of the timezone passed to the constructor. File core/lib/Drupal/Component/Datetime/DateTimePlus

public DateTimePlus::__call($method, $args)

The value of the language code passed to the constructor. File core/lib/Drupal/Component/Datetime/DateTimePlus