Dear Stata Users,

First, I want to create a year and month from "v1". I use the code below:

Code:
g year = substr(v1, 1, 4)
g month = substr(v1, 5, 6)
However, when I try to destring "year" and "month" I have the following thread:

year contains nonnumeric characters; no replace
Can you please help me how can I destring "year" and "month"? Below I attach a sample from my data.

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str32 v1 float(me1 me2 me3 me4)
"192512" 5.82 15.61 50.01    1319
"192601" 5.91  15.9 50.92 1331.71
"192602" 5.55 14.62 46.63 1366.39
"192603"    5  13.2 44.56 1322.46
"192604" 5.03 13.75    45 1350.21
"192605"  5.1 13.27  45.6 1382.58
"192606" 5.17 13.76    48 1510.46
"192607" 5.28  13.8 49.09 1521.25
"192608" 5.38 14.52 47.43 1561.71
"192609" 5.15  13.8 47.07 1576.54
"192610" 4.94 13.13 45.96 1581.94
"192611"  5.1 13.98 45.47 1608.91
"192612" 5.28 14.38 49.83 1595.12
"192701" 5.69 14.94 50.92 1628.38
"192702" 6.12 15.85 50.87 1690.91
"192703" 6.12 15.14 50.05 1768.07
"192704" 5.96  14.7 49.95 1729.49
"192705" 6.17  15.4 50.86 1841.78
"192706" 6.19 14.66 48.62 1774.64
"192707" 6.51 15.12 53.55 1925.16
"192708" 6.49 15.13 54.31  2140.2
"192709" 6.72 16.32  58.4  2314.2
"192710" 6.37 16.24 56.94 2231.55
"192711" 6.84 17.01 58.27 2257.65
"192712" 7.15 18.84 60.27  2401.2
"192801" 7.26 18.13 60.97 2335.95
"192802" 6.95 17.96  59.5 2381.62
"192803" 7.49 20.02 62.81  3253.8
"192804"  7.7  20.9 65.93 3292.95
"192805" 7.97 21.11 65.99  3358.2
"192806"  7.1 19.97 62.29    3306
"192807"  6.9 20.36 62.27 3347.32
"192808" 7.19 21.59 67.02 3536.55
"192809"  7.5  22.8 69.53 3769.27
"192810" 7.93  22.4 70.07 3806.25
"192811" 8.69 24.89 76.04  3680.1
"192812" 8.92 26.06 83.62 3545.25
"192901" 9.04 26.85 85.08 3637.69
"192902"    9 27.69 83.31 3643.12
"192903" 8.75 25.95 83.07  3697.5
"192904" 8.69 26.04 81.13 3675.75
"192905" 7.81 23.81 77.34    3045
"192906" 8.37 25.62 83.76  3262.5
"192907" 8.61 25.82 82.68 3516.82
"192908" 8.64 26.43 88.06 3926.02
"192909" 8.14  24.7 80.61 3860.29
"192910" 6.44 20.55 70.46 3244.02
"192911" 5.39 16.25 57.75  2946.5
"192912"  5.2 15.75 58.65 2939.89
"193001" 5.68 16.95 65.17 2958.06
"193002" 5.97 18.03 64.92 3179.38
"193003" 6.25 18.85 64.83 3488.23
"193004" 6.33    18 60.68 3329.68
"193005" 5.86 17.28 60.24  3588.5
"193006" 4.44  14.4 50.54  3257.7
"193007" 4.58 14.96 52.29 3284.78
"193008" 4.21 14.08 51.69 3809.98
"193009" 3.68 12.07 42.64 3580.54
"193010" 3.36 10.84 38.11 3439.35
"193011" 3.23 10.61 37.93 3315.81
"193012"  2.6  9.04 33.44 3152.55
"193101" 3.21 10.11 37.44 3306.98
"193102" 3.59 11.32 39.51 3507.74
"193103"  3.3 10.42 37.25 3403.53
"193104" 2.73  8.75 33.18 3277.39
"193105" 2.34  7.49 27.16 2971.05
"193106" 2.81  9.05 33.74 3234.59
"193107" 2.59  8.05 30.66  3058.9
"193108" 2.37  7.99 30.71 3088.18
"193109" 1.52   5.4 20.37 2353.86
"193110" 1.75  5.49 22.91 2482.26
"193111"  1.5   5.1 19.86 2329.08
"193112" 1.12  4.06 16.42 2178.32
"193201" 1.25  4.27 16.34 2087.36
"193202" 1.25  4.24 16.67 2353.24
"193203"  1.1  3.64 15.04 2057.04
"193204"  .87  3.04 12.78 1826.15
"193205"  .65  2.26  8.86 1644.24
"193206"  .66  2.29  9.35 1434.33
"193207"  .94  3.03  12.3 1674.56
"193208" 1.58  4.78 18.26 2136.34
"193209" 1.47  4.38 17.54 2096.69
"193210" 1.21  3.66 15.06 1933.44
"193211" 1.06  3.41  14.1 1912.45
"193212"   .9  3.11 13.85 1943.18
"193301"  .97   3.3 15.07 1950.18
"193302"  .76  2.73 12.45 1810.21
"193303"  .87  2.87 13.42 1651.59
"193304" 1.21  4.25 20.71  1866.2
"193305"  2.1  6.26 25.76 2190.45
"193306" 2.56  7.58 28.71 2377.07
"193307" 2.42   6.7 26.06  2258.1
"193308" 2.48  7.81 31.17 2365.41
"193309" 2.09  6.43 26.24 2244.11
"193310" 1.77  5.73 23.72 2085.48
"193311" 1.86   5.9  25.3 2213.78
"193312" 1.84  6.21 26.67 2083.15
"193401" 2.62  7.73 31.81 2202.12
"193402" 2.81  7.86 30.55 2248.77
"193403" 2.69   7.7 31.26 2237.11
end