Parsing time strings like “1h 30min”

Question

Anyone know of a Java library that can parse time strings such as \"30min\" or \"2h 15min\" or \"2d 15h 30min\" as milliseconds (or some kind of Duration object). Can Joda-T

Answer 1

FYI, Just wrote this for hour+ periods, only uses java.time.*, pretty simple to understand and customize for any need;

This version works with strings like; 3d12h, 2y, 9m10d, etc.

import java.time.Duration;
import java.time.Instant;
import java.time.Period;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Locale;

private static final Pattern periodPattern = Pattern.compile("([0-9]+)([hdwmy])");

public static Long parsePeriod(String period){
    if(period == null) return null;
    period = period.toLowerCase(Locale.ENGLISH);
    Matcher matcher = periodPattern.matcher(period);
    Instant instant=Instant.EPOCH;
    while(matcher.find()){
        int num = Integer.parseInt(matcher.group(1));
        String typ = matcher.group(2);
        switch (typ) {
            case "h":
                instant=instant.plus(Duration.ofHours(num));
                break;
            case "d":
                instant=instant.plus(Duration.ofDays(num));
                break;
            case "w":
                instant=instant.plus(Period.ofWeeks(num));
                break;
            case "m":
                instant=instant.plus(Period.ofMonths(num));
                break;
            case "y":
                instant=instant.plus(Period.ofYears(num));
                break;
        }
    }
    return instant.toEpochMilli();
}