sag333ar

// Generates alpha-numeric-random string
- (NSString *)genRandStringLength:(int)len {
    static NSString *letters = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    NSMutableString *randomString = [NSMutableString stringWithCapacity: len];
    for (int i=0; i<len; i++) {
        [randomString appendFormat: @"%C", [letters characterAtIndex: arc4random() % [letters length]]];
    }
    return randomString;
}

sag333ar

// get the IP address of current-device
- (NSString *)getIPAddress {
    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;
    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0) {
        // Loop through linked list of interfaces

sag333ar

- (NSString*)current_DateTimeStamp {
    NSTimeInterval interval = [[NSDate date] timeIntervalSince1970];
    NSNumber *number = [NSNumber numberWithDouble:interval];
    return [number stringValue];
}

sag333ar

- (NSDate*)twoMonthspastDate {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:now];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month-2;
    comp.year = comp.year;
    comp.day = 1;
    [comp setHour:0];
    [comp setMinute:0];

sag333ar

- (NSDate*) currentDate_midnightTime {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:now];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month;
    comp.year = comp.year;
    comp.day = comp.day;
    [comp setHour:0];
    [comp setMinute:0];

sag333ar

// add 23:59:59 hours to - (assume today is 30-Jul-2013) example range yesterday = 29-Jul-2013 12:00:00 AM + "to" + 30-Jul-2013 23:59:59 PM
- (NSDate*)add24HoursToDate:(NSDate*)date {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:date];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month;
    comp.year = comp.year;
    comp.day = comp.day;
    [comp setHour:23];
    [comp setMinute:59];

sag333ar

- (NSDate*)remove24HoursToDate:(NSDate*)date  {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:date];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month;
    comp.year = comp.year;
    comp.day = comp.day;
    [comp setHour:0];
    [comp setMinute:0];
    [comp setSecond:0];

sag333ar

-(NSDate *)firstDateForLastMonth {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:now];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month-1;
    comp.year = comp.year;
    comp.day = 1;
    [comp setHour:0];
    [comp setMinute:0];

sag333ar

-(NSDate *)yesterday {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:now];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month;
    comp.year = comp.year;
    comp.day = comp.day-1;
    [comp setHour:0];
    [comp setMinute:0];

sag333ar

- (NSDate *)lastWeek {
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *comp = [cal components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:now];
    comp.timeZone=[NSTimeZone defaultTimeZone];
    comp.month = comp.month;
    comp.year = comp.year;
    comp.day = comp.day-7;
    [comp setHour:0];
    [comp setMinute:0];