Example usage for java.time LocalDateTime minusMonths

Introduction

In this page you can find the example usage for java.time LocalDateTime minusMonths.

Prototype

public LocalDateTime minusMonths(long months) 

Source Link

Document

Returns a copy of this LocalDateTime with the specified number of months subtracted.

Usage

From source file:Main.java

public static void main(String[] args) {
    LocalDateTime a = LocalDateTime.of(2014, 6, 30, 12, 00);

    LocalDateTime t = a.minusMonths(10);

    System.out.println(t);//  www. j  a  v  a  2  s . c  o m
}

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From source file:org.ambraproject.rhino.rest.controller.ArticleCrudController.java

/**
 * Calculate the date range using the specified rule. For example:
 *
 * <ul>//from  w  w w  . j  a va  2s.  c  om
 * <li>sinceRule=2y  - 2 years</li>
 * <li>sinceRule=5m  - 5 months</li>
 * <li>sinceRule=10d - 10 days</li>
 * <li>sinceRule=5h  - 5 hours</li>
 * <li>sinceRule=33  - 33 minutes</li>
 * </ul>
 *
 * The method will result in a {@link java.util.Map Map} containing the following keys:
 *
 * <ul>
 * <li><b>fromDate</b> - the starting date
 * <li><b>toDate</b> - the ending date, which will be the current system date (i.e. now())
 * </ul>
 *
 * @param sinceRule The rule to calculate the date range
 *
 * @return A {@link java.util.Map Map}
 */
public static final Map<String, LocalDateTime> calculateDateRange(String sinceRule) {
    if (StringUtils.isBlank(sinceRule)) {
        return ImmutableMap.of();
    }

    final String timeDesignation = StringUtils.right(sinceRule, 1);
    long timeDelta = 0;
    try {
        // Assume last character is NOT a letter (i.e. all characters are digits).
        timeDelta = Long.parseLong(sinceRule);
    } catch (NumberFormatException exception) {
        // If an exception, then last character MUST have been a letter,
        // so we now exclude the last character and re-try conversion.
        try {
            timeDelta = Long.parseLong(sinceRule.substring(0, sinceRule.length() - 1));
        } catch (NumberFormatException error) {
            log.warn("Failed to convert {} to a timeDelta/timeDesignation!", sinceRule);
            timeDelta = 0;
        }
    }

    if (timeDelta < 1) {
        return ImmutableMap.of();
    }

    final LocalDateTime toDate = LocalDateTime.now();
    final LocalDateTime fromDate;
    if (timeDesignation.equalsIgnoreCase("y")) {
        fromDate = toDate.minusYears(timeDelta);
    } else if (timeDesignation.equalsIgnoreCase("m")) {
        fromDate = toDate.minusMonths(timeDelta);
    } else if (timeDesignation.equalsIgnoreCase("d")) {
        fromDate = toDate.minusDays(timeDelta);
    } else if (timeDesignation.equalsIgnoreCase("h")) {
        fromDate = toDate.minus(timeDelta, ChronoUnit.HOURS);
    } else {
        fromDate = toDate.minus(timeDelta, ChronoUnit.MINUTES);
    }

    final ImmutableMap<String, LocalDateTime> dateRange = ImmutableMap.of(FROM_DATE, fromDate, TO_DATE, toDate);
    return dateRange;
}

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