How to reinstall OS in Macbook Air 2013?

Hi,
I bought my Macbook Air 2013 this year, I was quite happy with my macbook. I have not been able to use my macbook for around one month and didn't be able to update the operating sofware. Batery was down. After charging i reopened it, Now i found the date is changed to 2008. So some functions including date change options in the System Preferences is not working. Can not be able to connect with apple either. Don't know what to do? as a new user, need help. Please tell me what to do? whether I have to reinstall the OS? How to do that?

Reset SMC and PRAM
http://support.apple.com/kb/ht3964

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I have a 6 month old Macbook AIr 2013 and I am getting sub 4 hours of battery life against the 12 hrs advertised. I looked into the application monitor and found that Spotlight has been causing my battery to drain
Here is a brief snapshot of System information
Hardware Overview:
Model Name:          MacBook Air
Model Identifier:          MacBookAir6,2
Processor Name:          Intel Core i5
Processor Speed:          1.3 GHz
Number of Processors:          1
Total Number of Cores:          2
L2 Cache (per Core):          256 KB
L3 Cache:          3 MB
Memory:          4 GB
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Manufacturer:          SMP
Device Name:          bq20z451
Pack Lot Code:          0
PCB Lot Code:          0
Firmware Version:          511
Hardware Revision:          000a
Cell Revision:          1200
Charge Information:
Charge Remaining (mAh):          6362
Fully Charged:          No
Charging:          No
Full Charge Capacity (mAh):          7023
Health Information:
Cycle Count:          16
Condition:          Normal
Battery Installed:          Yes
Amperage (mA):          -1727
Voltage (mV):          8266
System Power Settings:
AC Power:
System Sleep Timer (Minutes):          1
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          10
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Wake on LAN:          Yes
AutoPowerOff Delay:          14400
AutoPowerOff Enabled:          1
DarkWakeBackgroundTasks:          1
Display Sleep Uses Dim:          Yes
PrioritizeNetworkReachabilityOverSleep:          0
Standby Delay:          10800
Standby Enabled:          1
Battery Power:
System Sleep Timer (Minutes):          1
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          2
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
AutoPowerOff Delay:          14400
AutoPowerOff Enabled:          1
Current Power Source:          Yes
DarkWakeBackgroundTasks:          0
Display Sleep Uses Dim:          Yes
Reduce Brightness:          Yes
Standby Delay:          10800
Standby Enabled:          1
Hardware Configuration:
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AC Charger Information:
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1. Follow these instructions, or these for OS X 10.9 or later.
2. In the Energy Saver preference pane, uncheck the box marked
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Hello,
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Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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Installing and booting
Booting from a normal 2013.6 USB key works fine, but I couldn't seem to get either GRUB or Syslinux working.
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ata1.00: failed command: WRITE FPDMA QUEUED
ata1.00: cmd 61/08:f0:10:8c:c2/00:00:0b:00:00/40 tag 30 ncq 4096 out res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
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journalctl -b
dmesg
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uname -a:
Linux temperance 3.9.7-1-ARCH #1 SMP PREEMPT Thu Jun 20 22:45:32 CEST 2013 x86_64 GNU/Linux
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Separate thread.
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Separate thread
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Last edited by Legogris (2013-06-27 20:21:11)

While I'm using Ubuntu and not Arch, I wanted to chip in with my experiences.
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