1121 static {
1122 ISO_WEEK_DATE = new DateTimeFormatterBuilder()
1123 .parseCaseInsensitive()
1124 .appendValue(IsoFields.WEEK_BASED_YEAR, 4, 10, SignStyle.EXCEEDS_PAD)
1125 .appendLiteral("-W")
1126 .appendValue(IsoFields.WEEK_OF_WEEK_BASED_YEAR, 2)
1127 .appendLiteral('-')
1128 .appendValue(DAY_OF_WEEK, 1)
1129 .optionalStart()
1130 .appendOffsetId()
1131 .toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
1132 }
1133
1134 //-----------------------------------------------------------------------
1135 /**
1136 * The ISO instant formatter that formats or parses an instant in UTC,
1137 * such as '2011-12-03T10:15:30Z'.
1138 * <p>
1139 * This returns an immutable formatter capable of formatting and parsing
1140 * the ISO-8601 instant format.
1141 * When formatting, the second-of-minute is always output.
1142 * The nano-of-second outputs zero, three, six or nine digits as necessary.
1143 * When parsing, time to at least the seconds field is required.
1144 * Fractional seconds from zero to nine are parsed.
1145 * The localized decimal style is not used.
1146 * <p>
1147 * This is a special case formatter intended to allow a human readable form
1148 * of an {@link java.time.Instant}. The {@code Instant} class is designed to
1149 * only represent a point in time and internally stores a value in nanoseconds
1150 * from a fixed epoch of 1970-01-01Z. As such, an {@code Instant} cannot be
1151 * formatted as a date or time without providing some form of time-zone.
1152 * This formatter allows the {@code Instant} to be formatted, by providing
1153 * a suitable conversion using {@code ZoneOffset.UTC}.
1154 * <p>
1155 * The format consists of:
1156 * <ul>
1157 * <li>The {@link #ISO_OFFSET_DATE_TIME} where the instant is converted from
1158 * {@link ChronoField#INSTANT_SECONDS} and {@link ChronoField#NANO_OF_SECOND}
1159 * using the {@code UTC} offset. Parsing is case insensitive.
1160 * </ul>
1161 * <p>
1162 * The returned formatter has no override chronology or zone.
1163 * It uses the {@link ResolverStyle#STRICT STRICT} resolver style.
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1121 static {
1122 ISO_WEEK_DATE = new DateTimeFormatterBuilder()
1123 .parseCaseInsensitive()
1124 .appendValue(IsoFields.WEEK_BASED_YEAR, 4, 10, SignStyle.EXCEEDS_PAD)
1125 .appendLiteral("-W")
1126 .appendValue(IsoFields.WEEK_OF_WEEK_BASED_YEAR, 2)
1127 .appendLiteral('-')
1128 .appendValue(DAY_OF_WEEK, 1)
1129 .optionalStart()
1130 .appendOffsetId()
1131 .toFormatter(ResolverStyle.STRICT, IsoChronology.INSTANCE);
1132 }
1133
1134 //-----------------------------------------------------------------------
1135 /**
1136 * The ISO instant formatter that formats or parses an instant in UTC,
1137 * such as '2011-12-03T10:15:30Z'.
1138 * <p>
1139 * This returns an immutable formatter capable of formatting and parsing
1140 * the ISO-8601 instant format.
1141 * When formatting, the instant will always be suffixed by 'Z' to indicate UTC.
1142 * The second-of-minute is always output.
1143 * The nano-of-second outputs zero, three, six or nine digits as necessary.
1144 * When parsing, the behaviour of {@link DateTimeFormatterBuilder#appendOffsetId()} will be used to
1145 * parse the offset, converting the instant to UTC as necessary.
1146 * The time to at least the seconds field is required.
1147 * Fractional seconds from zero to nine are parsed.
1148 * The localized decimal style is not used.
1149 * <p>
1150 * This is a special case formatter intended to allow a human readable form
1151 * of an {@link java.time.Instant}. The {@code Instant} class is designed to
1152 * only represent a point in time and internally stores a value in nanoseconds
1153 * from a fixed epoch of 1970-01-01Z. As such, an {@code Instant} cannot be
1154 * formatted as a date or time without providing some form of time-zone.
1155 * This formatter allows the {@code Instant} to be formatted, by providing
1156 * a suitable conversion using {@code ZoneOffset.UTC}.
1157 * <p>
1158 * The format consists of:
1159 * <ul>
1160 * <li>The {@link #ISO_OFFSET_DATE_TIME} where the instant is converted from
1161 * {@link ChronoField#INSTANT_SECONDS} and {@link ChronoField#NANO_OF_SECOND}
1162 * using the {@code UTC} offset. Parsing is case insensitive.
1163 * </ul>
1164 * <p>
1165 * The returned formatter has no override chronology or zone.
1166 * It uses the {@link ResolverStyle#STRICT STRICT} resolver style.
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