/** * Checks if the specified field is supported. * <p> * This checks if this time can be queried for the specified field. * If false, then calling the {@link #range(TemporalField) range}, * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)} * methods will throw an exception. * <p> * If the field is a {@link ChronoField} then the query is implemented here. * The supported fields are: * <ul> * <li>{@code NANO_OF_SECOND} * <li>{@code NANO_OF_DAY} * <li>{@code MICRO_OF_SECOND} * <li>{@code MICRO_OF_DAY} * <li>{@code MILLI_OF_SECOND} * <li>{@code MILLI_OF_DAY} * <li>{@code SECOND_OF_MINUTE} * <li>{@code SECOND_OF_DAY} * <li>{@code MINUTE_OF_HOUR} * <li>{@code MINUTE_OF_DAY} * <li>{@code HOUR_OF_AMPM} * <li>{@code CLOCK_HOUR_OF_AMPM} * <li>{@code HOUR_OF_DAY} * <li>{@code CLOCK_HOUR_OF_DAY} * <li>{@code AMPM_OF_DAY} * </ul> * All other {@code ChronoField} instances will return false. * <p> * If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} * passing {@code this} as the argument. * Whether the field is supported is determined by the field. * * @param TemporalField $field the field to check, null returns false * @return bool true if the field is supported on this time, false if not */ public function isSupported(TemporalField $field) { if ($field instanceof ChronoField) { return $field->isTimeBased(); } return $field != null && $field->isSupportedBy($this); }