The Hebrew Calendar is Lunar based.  The New Moon notes the first day of the month.  Occasionally, the "official" calendar deviates
from the actual New Moon.
HEBREW CALENDAR GREGORIAN CALENDAR
RED INDICATES DATES OF NOTE BLUE INDICATES NEW MOON
NISSAN - 5772 MAR/APR - 2012
S M T W T F S S M T W T F S
1 24
2 3 4 5 6 7 8 25 26 27 28 29 30 31
9 10 11 12 13 14 15 APR 1 2 3 4 5 6 7
16 17 18 19 20 21 22 8 9 10 11 12 13 14
23 24 25 26 27 28 29 15 16 17 18 19 20 21
30 22
IYAR - 5772 APR/MAY - 2012
S M T W T F S S M T W T F S
1 2 3 4 5 6 23 24 25 26 27 28
7 8 9 10 11 12 13 29 30 MAY 1 2 3 4 5
14 15 16 17 18 19 20 6 7 8 9 10 11 12
21 22 23 24 25 26 27 13 14 15 16 17 18 19
28 29 20 21
SIVAN - 5772 MAY/JUNE - 2012
S M T W T F S S M T W T F S
1 2 3 4 5 22 23 24 25 26
6 7 8 9 10 11 12 27 28 29 30 31 JUNE 1 2
13 14 15 16 17 18 19 3 4 5 6 7 8 9
20 21 22 23 24 25 26 10 11 12 13 14 15 16
27 28 29 30 17 18 19 20
TAMMUZ - 5772 JUNE/JULY - 2012
S M T W T F S S M T W T F S
1 2 3 21 22 23
4 5 6 7 8 9 10 24 25 26 27 28 29 30
11 12 13 14 15 16 17 JULY 1 2 3 4 5 6 7
18 19 20 21 22 23 24 8 9 10 11 12 13 14
25 26 27 28 29 15 16 17 18 19
AV - 5772 JULY/AUG - 2012
S M T W T F S S M T W T F S
1 2 20 21
3 4 5 6 7 8 9 22 23 24 25 26 27 28
10 11 12 13 14 15 16 29 30 31 AUG 1 2 3 4
17 18 19 20 21 22 23 5 6 7 8 9 10 11
24 25 26 27 28 29 30 12 13 14 15 16 17 18
ELUL - 5772 AUG/SEPT - 2012
S M T W T F S S M T W T F S
1 2 3 4 5 6 7 19 20 21 22 23 24 25
8 9 10 11 12 13 14 26 27 28 29 30 31 SEPT 1
15 16 17 18 19 20 21 2 3 4 5 6 7 8
22 23 24 25 26 27 28 9 10 11 12 13 14 15
29 16
TISHRI - 5773 SEPT/OCT - 2012
S M T W T F S S M T W T F S
1 2 3 4 5 6 17 18 19 20 21 22
7 8 9 10 11 12 13 23 24 25 26 27 28 29
14 15 16 17 18 19 20 30 OCT 1 2 3 4 5 6
21 22 23 24 25 26 27 7 8 9 10 11 12 13
28 29 30 14 15 16
HESHVAN - 5773 OCT/NOV - 2012
S M T W T F S S M T W T F S
1 2 3 4 17 18 19 20
5 6 7 8 9 10 11 21 22 23 24 25 26 27
12 13 14 15 16 17 18 28 29 30 31 NOV 1 2 3
19 20 21 22 23 24 25 4 5 6 7 8 9 10
26 27 28 29 11 12 13 14
KISLEV - 5773 NOV/DEC - 2012
S M T W T F S S M T W T F S
1 2 3 15 16 17
4 5 6 7 8 9 10 18 19 20 21 22 23 24
11 12 13 14 15 16 17 25 26 27 28 29 30 DEC 1
18 19 20 21 22 23 24 2 3 4 5 6 7 8
25 26 27 28 29 9 10 11 12 13
TEVETH - 5773 DEC/JAN - 2013
S M T W T F S S M T W T F S
1 2 14 15
3 4 5 6 7 8 9 16 17 18 19 20 21 22
10 11 12 13 14 15 16 23 24 25 26 27 28 29
17 18 19 20 21 22 23 30 31 JAN 1 2 3 4 5
24 25 26 27 28 29 6 7 8 9 10 11
SHEBAT - 5773 JAN/FEB - 2013
S M T W T F S S M T W T F S
1 12
2 3 4 5 6 7 8 13 14 15 16 17 18 19
9 10 11 12 13 14 15 20 21 22 23 24 25 26
16 17 18 19 20 21 22 27 28 29 30 31 FEB 1 2
23 24 25 26 27 28 29 3 4 5 6 7 8 9
30 10
ADAR - 5773 FEB/MAR - 2013
S M T W T F S S M T W T F S
1 2 3 4 5 6 11 12 13 14 15 16
7 8 9 10 11 12 13 17 18 19 20 21 22 23
14 15 16 17 18 19 20 24 25 26 27 28 MAR 1 2
21 22 23 24 25 26 27 3 4 5 6 7 8 9
28 29 10 11
Nisan 1 Correct beginning of the year - Exodus 12:1-6
Nisan 10 Passover Lamb chosen (Exodus 12:3)
Nisan 14 Passover begins at Sundown (Leviticus 23:5)
Nisan 15 The Feast of Unleavened Bread (Leviticus 23:6)
The first Sunday after Passover is the Day of Firstfruits
and begins the fifty day count for Pentecost  (Leviticus 23:11)
Sivan 6 Shavuot - Pentecost (Leviticus 23:16)
Tammuz 17 Traditional anniversary of destruction of the walls of Jerusalem (twice)
Av 9 Traditional anniversary of destruction of the Temple (twice)
Tishri 1 Rosh HaShanah - Feast of Trumpets (Leviticus 23:23)
Tishri 10 Yom Kippur - Day of Atonement (Leviticus 23:26)
Tishri 15 Sukkot - Feast of Booths, Feast of Harvest (Leviticus 23:33)
Kislev 25 Chanukah - Festival of Lights (see History of Maccabean Revolt)
Adar 14 & 15 Purim - see Book of Esther