https://www.javatpoint.com/java-date
https://www.baeldung.com/java-8-date-time-intro
https://javautodidacta.es/tiempo-en-java-localdate-localtime/
Formatos:
| Symbol | Meaning | Presentation | Examples | 
|---|---|---|---|
| G | era | text | AD; Anno Domini; A | 
| u | year | year | 2004; 04 | 
| y | year-of-era | year | 2004; 04 | 
| D | day-of-year | number | 189 | 
| M/L | month-of-year | number/text | 7; 07; Jul; July; J | 
| d | day-of-month | number | 10 | 
| g | modified-julian-day | number | 2451334 | 
| Q/q | quarter-of-year | number/text | 3; 03; Q3; 3rd quarter | 
| Y | week-based-year | year | 1996; 96 | 
| w | week-of-week-based-year | number | 27 | 
| W | week-of-month | number | 4 | 
| E | day-of-week | text | Tue; Tuesday; T | 
| e/c | localized day-of-week | number/text | 2; 02; Tue; Tuesday; T | 
| F | day-of-week-in-month | number | 3 | 
| a | am-pm-of-day | text | PM | 
| h | clock-hour-of-am-pm (1-12) | number | 12 | 
| K | hour-of-am-pm (0-11) | number | 0 | 
| k | clock-hour-of-day (1-24) | number | 24 | 
| H | hour-of-day (0-23) | number | 0 | 
| m | minute-of-hour | number | 30 | 
| s | second-of-minute | number | 55 | 
| S | fraction-of-second | fraction | 978 | 
| A | milli-of-day | number | 1234 | 
| n | nano-of-second | number | 987654321 | 
| N | nano-of-day | number | 1234000000 | 
| V | time-zone ID | zone-id | America/Los_Angeles; Z; -08:30 | 
| v | generic time-zone name | zone-name | Pacific Time; PT | 
| z | time-zone name | zone-name | Pacific Standard Time; PST | 
| O | localized zone-offset | offset-O | GMT+8; GMT+08:00; UTC-08:00 | 
| X | zone-offset ‘Z’ for zero | offset-X | Z; -08; -0830; -08:30; -083015; -08:30:15 | 
| x | zone-offset | offset-x | +0000; -08; -0830; -08:30; -083015; -08:30:15 | 
| Z | zone-offset | offset-Z | +0000; -0800; -08:00 | 
| p | pad next | pad modifier | 1 | 
| ‘ | escape for text | delimiter | |
| » | single quote | literal | ‘ | 
| [ | optional section start | ||
| ] | optional section end | ||
| # | reserved for future use | ||
| { | reserved for future use | ||
| } | reserved for future use |